The Planted Tank Forum

The Planted Tank Forum (
-   Algae (
-   -   The "One-Two Punch" Whole Tank Algae Treatment (

DarkCobra 01-02-2013 10:31 PM

The "One-Two Punch" Whole Tank Algae Treatment
NOTE: Others have reported deaths of shrimp, snails, and fish - particularly known sensitive ones. Please read the entire thread for details before experimenting. For anyone who wishes to try this, I am changing my initial recommendation for H2O2 to 2 tbsp. per 10G, down from 4 tbsp. This treatment seems especially hit-and-miss with shrimp, so for them, I do not recommend this treatment AT ALL - unless you consider them expendable.


This is a technique I've developed. While I've provided this info in several threads now as personalized help, I feel it deserves a full write-up in its own thread.

In brief: It uses a properly executed H2O2 whole tank treatment, followed by a whole tank Excel treatment, to provide a much greater algicidal effect than either alone; without noticeably increased risk to fauna or plants.

This has been performed by me many times, and by others only a few. While in all cases no adverse effects were observed, I cannot guarantee it to be 100% safe. Only through many more tests in a wide variety of tanks can that be established. Keep that in mind should you decide to try it, and if you do, please share your results in this thread.

Even if you don't try this, you may still find some of it informative.


Whole tank H2O2 treatments don't get much attention. The results are typically very poor, at least until you get into such doses that fauna are at risk; and after a few failed attempts, most folks understandably write this option off.

But the truth is, most people perform this treatment completely wrong.

The WRONG Way:

Typically, the first thing done is to turn off the filters and lights. Already, one mistake has potentially been made, and a path paved to another.

Turning off the filters does prevent H2O2 from flowing through the biomedia. That's good, because we don't want the H2O2 to kill too much nitrifying bacteria, nor want the H2O2 depleted at this point in reaction with these bacteria. But often, this leaves little or no flow in the tank.

The effect of any chemical is determined by: Concentration * Flow * Time.

A H2O2 spot treatment works with no flow, solely because of the incredibly high concentration at the location where it's applied. But in a whole tank treatment, it's far more dilute. So instead, high flow is required to carry it around the tank, to contact the algae and have some positive effect.

Without that, there is only one place where high flow is occurring. Fish gills. And that is the one thing we don't want the H2O2 reacting with!

Moving on now. The H2O2 is added. Some amount of time is allowed to elapse, a half hour or so. Then the treatment is "terminated", by turning filters and lights back on. This is the next mistake.

Virtually all of the H2O2 still exists in the tank, because without flow, very little of it has reacted with anything. While light does break down H2O2, this is measured in days - even in direct sunlight. Not minutes. So the light has no effect, in the time scales we're working with.

The biofilter at least is now reducing the H2O2. And with flow restored, the H2O2 is at last starting to have some effect on the algae. But the fish are already getting close to suffering noticeable stress. The full concentration of H2O2 has been flowing through their gills for a half hour, completely without reason since this time did nothing to kill the algae. And they will continue to be exposed to gradually lessening concentrations, further increasing the stress, as the filter slowly removes it. It may take another half hour before H2O2 is sufficiently reduced.

The RIGHT Way:

As I said before, Concentration * Flow * Time.

So if you want an effective treatment, provide massive flow during the entire treatment period. Since flow is constant through fish gills, to protect them you shorten the time, by wasting none of it with periods where the algae isn't affected, and correctly terminating the treatment. If this is done, the increase in safety is actually enough that concentration can be increased.

First, prepare the tank. You want as much flow as possible. If you have extra powerheads, add them. If your sole source of flow is your filters, you'll have to temporarily remove the filter media to a bucket of tank water, and leave the filters on. Otherwise, this is optional but still beneficial. I have a cheap Koralia clone that with 1,320GPH flow, turned out to be too much for any of my tanks; but I keep it around because it's ideal for this treatment.

If you have Marimo balls, temporarily remove them to a bucket of tank water as well. Cladophora is very hardy, and normally not affected by whole tank H2O2 treatments. But this treatment can burn them badly, especially on sides exposed to direct flow. If they're also infested with undesirable algae, they can be treated simply by keeping them in the bucket in a dark place for a week. They can tolerate extremely long blackouts without harm, unlike other algae.

Keep the lights on. Light has no effect on the H2O2, only your ability to see what's going on.

Now add 3% H2O2, at a dosage of 4 tbsp. per 10G of actual tank water volume (excluding substrate, plants, etc). Yes, that's double what's typically used; as explained previously we can use a higher concentration.

Allow to circulate for 15 minutes. During this time, redirect flow a few times if possible, to make sure all areas get covered. If you have particular trouble spots, try to ensure they get direct flow during part of the treatment.

Now terminate the treatment. Do a 50% water change, or more if you know it's well tolerated. Return the tank to its normal configuration, including replacing filter media if it was removed.

Less hardy algae may be effectively killed by this alone, especially if flow was good. But all algae will be weakened, and now it's time for:


Any remaining algae not killed by the H2O2 is now extremely susceptible to Excel.

If you weren't already using Excel, or were using it at the recommended dose, add Seachem's recommended initial dose of 5ml per 10G. No further large doses are necessary in this case. Algae builds up some tolerance to Excel, similar to sensitive plants like Vals. In this case, the H2O2 treatment followed by a single, sudden Excel spike is enough to quickly finish algae off.

If you were already using Excel overdoses, continue using the previous dose.

Enjoy your algae-free tank. If there are any underlying problems that caused the algae outbreak in the first place, correct them so your tank stays algae-free. In some cases, a thorough algae removal like this is enough to improve plant health to the point where algae will not return.


I've used this treatment many times over the course of the last year.

It was originally developed to deal with what I call my SOS, "Staghorn On Steroids", as featured in my signature. SOS doesn't behave quite according to the rules. Like most algae it likes high light, but will thrive in medium light if flow is high. It laughs at high CO2, H2O2 spot treatments, and Excel spot/tank treatments. But it falls hard to the "One-Two Punch", and I relied on this treatment heavily when trying to figure out how to keep it from growing. Which took a while, during which time I probably would have given up in frustration if I hadn't found a way to periodically eliminate it, without ripping out half my plants after each failed tank parameter adjustment.

I've tried it on other algae too, mostly out of curiosity rather than necessity. Works great. Burning my Marimo balls was a nasty surprise, but certainly showed how effective it is, as they've never been affected by any other algicidal treatment. Should I ever have an invasive clado problem, I expect this might be able to eliminate it.

I've never seen any adverse effect on the more sensitive inhabitants of my tank; including otos, cories, bamboo shrimp, ramshorn and pond snails. No idea if it's safe for other shrimp, as I keep no other varieties. I'd like to see someone try it on a tank with a few expendable cherries. Java moss was unaffected. I have some anacharis, which is particularly sensitive to Excel, but which I've gradually acclimated to a normal dose; it too is unharmed by this treatment. Hopefully others can soon add their experiences.

Off-topic but related. Recently I see the use of AlgaeFix being more freely discussed, now that certain people have finally softened their views on it, and mentioning it no longer results in guaranteed chastisement. Yes, it works, I've used it, and it's certainly easier than my method. But it isn't safe for invertebrates. Several times I've also had fish severely stressed or killed by AlgaeFix, and although in the majority of cases this doesn't happen, I consider it a gamble. I have an idea why this occurs different from other hypothesis I've seen, and how it might be avoided, but that's a topic for another thread I'll soon post. At this time I consider my treatment possibly safer than AlgaeFix when a powerful full tank treatment is required, and certainly usable in more circumstances.

Hope this proves useful to you!

Shangrila 01-02-2013 11:15 PM

Is this invertabrate safe?

DarkCobra 01-02-2013 11:18 PM


Originally Posted by Shangrila (Post 2139878)
Is this invertabrate safe?

Has been so far. See "Closing Notes", paragraph #4 for a list of what it's been tried with.

Shangrila 01-02-2013 11:19 PM

How the hell did I miss that?

blink 01-03-2013 12:59 AM

I wish I'd seen this before tearing down my old tank as I never could get the black bush out of my fissidens. I've been trying a blackout but the moss seems to be losing the fight, so perhaps I'll set up a couple powerheads in my quarantine bucket and give this a try as I'd really like to salvage what's left of the moss.

creekbottom 01-03-2013 03:39 AM

This is a great write up on how to do this, Thanks!

I nuked my tank tonight, several hours on and things look like they are still 'fizzing.' Is this normal?

I did a 50% WC. All the fish seem fine so far - Otto's, silver tips, and chili rasboras.

plantbrain 01-03-2013 04:28 AM


Originally Posted by Shangrila (Post 2139878)
Is this invertabrate safe?


I think one of the key points is massive circulation asap once you add a whole higher shock ppm of a chemical treatment. The Algaefix will also have the same increase effectiveness if you do that since it, like H2O2 and Excel, will bind to organic matter and is heavier than water,(thus sinks in low current).

Good key point.

DarkCobra 01-03-2013 04:58 AM


Originally Posted by creekbottom (Post 2140494)
I nuked my tank tonight, several hours on and things look like they are still 'fizzing.' Is this normal?

It's normal. When H2O2 reacts with organic material, it produces oxygen - lots of it. The H2O2 is essentially gone at this point, but it takes a while for all the excess dissolved oxygen generated earlier to slowly bubble out of solution.

The 50% water change, if performed with tap water, is also loaded with dissolved gasses. Chances are, you've heard of or witnessed "false pearling" after a water change.

In this case, because both the old and new water are saturated with gasses, it can be quite a show.

AnotherHobby 01-03-2013 03:04 PM

This is a great write-up! Thank you!

I've been having some algae issues and I know it's related to the inconsistent nature of my DIY CO2. I'm almost done building a pressurized system and should be up and running before the end of the month. It's good to know that I have a way of nuking all of it and starting over when I switch over. It'll be a lot easier to monitor what's going on.

jonathan 01-03-2013 05:40 PM

Thank you for the write up :)

Which algae is this good for ? Is there any that you would consider this a waste of effort on ?

nvladik 01-03-2013 06:15 PM


Originally Posted by plantbrain (Post 2140578)

I think one of the key points is massive circulation asap once you add a whole higher shock ppm of a chemical treatment. The Algaefix will also have the same increase effectiveness if you do that since it, like H2O2 and Excel, will bind to organic matter and is heavier than water,(thus sinks in low current).

Good key point.

Hi Tom, would you say it's safe for a colony of reds with berried females ready to pop?

DarkCobra 01-03-2013 08:45 PM


Originally Posted by jonathan (Post 2143473)
Which algae is this good for ? Is there any that you would consider this a waste of effort on ?

It appears to be good for anything except hard spot algae. With those, any chemical treatment only kills the outer layer; which, since it takes a few days for the killed portion to flake away, effectively shields the remainder from exposure. So an effective treatment only shrinks a spot.

I've completely removed heavy spot algae from both an anubia leaf and a resin ornament, mostly just to see if it could be done. It took somewhere in the range of seven H2O2 spot treatments, over three weeks, for complete removal. Definitely a waste of effort!

plantbrain 01-03-2013 10:07 PM


Originally Posted by nvladik (Post 2143745)
Hi Tom, would you say it's safe for a colony of reds with berried females ready to pop?

You might lose a few, but unless you lay it on, you will not eradicate them, they are nearly immortal. CO2(lots) likely is a better method to kill shrimp off.

I suppose you could also spot dose moss and other hard to kill green hair algae, or take a bunch of plants, and dip then rinse, then return etc.

Busan 77 is the herbicide in algaefix:

I suppose you could use the several hammer approach, use this, plus H2O2, plus Excel.

They all have different modes of action.

But without addressing the root issue, mostly CO2 and decent O2, good general care, catching things asap........your labor tends to be wasted.

If you catch various algae right away, then these treatments are MUCH more effective, and the algae is less of an issue. I tried this and found I needed 1/2 or less the concentrations for similar efficacy for all 3 algae killers.

You can test this in a non CO2 holding tank, and add culls for toxicity for shrimp.

Pretty easy to evaluate. I'm leary telling folks this stuff, but always mention the root cause is far far more imperative. If you do test algae, you need to know how to induce it, and also, get rid of it, so you can start again and test it more than once.

Few bother doing that. But if you keep having it come back again and again, well, you can at least test again a few times. Best to focus on the plants, then come back this stuff once the new algae growth stops, so you get something for all your labor.

acitydweller 01-03-2013 10:10 PM

Playing devils advocate, What would be a good preventive measure besides water changes and lower light periods paired with sufficient bps of co2? I for one would not discount the hammer approach but often find prevention and preventive measures more fruitful in the long run and less dramatic/intensive for all involved parties.

DarkCobra 01-04-2013 12:13 AM

Since there's so much interest in AlgaeFix, I went ahead and posted my promised write-up on it:

AlgaeFix: Experiences, Experiments, and Thoughts

But feel free to continue discussion of AlgaeFix in this thread. Or other treatment/prevention methods. It's all related.

All times are GMT. The time now is 08:13 AM.

Powered by vBulletin®
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
User Alert System provided by Advanced User Tagging (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.