Can't get on top of algae problem - The Planted Tank Forum
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post #1 of 5 (permalink) Old 04-27-2020, 05:38 PM Thread Starter
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Can't get on top of algae problem

Hi
I wonder if anyone can help?
I have a 230l planted tank. It is about 18 months old. I can't get on top of the green algae and diatoms and the plants just will not grow. I have tested all of the levels and they seem fine. I have two 59w, 93cm Superfish LED lights which are on for 7 hours a day which we have reduced from 8 hours a day. We feed with 1 capful of flourish iron and one capful of flourish excel twice a week. We change 20% of the water and clean the tank every week but the algae is back in a couple of days. The CO2 concentration is 28mg/l. Please can anyone advise?
Thanks
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post #2 of 5 (permalink) Old 04-27-2020, 06:02 PM
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Are you dosing ferts? That could be a reason why the plants aren't growing. What is your substrate? Any hardscape in the tank? You say the levels are fine...what did you test for? Green algae could be from too much light and/or not enough nutrients or too much phosphate. The diatoms are also possibly from too much light or high level of silicates and/or phosphate.


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post #3 of 5 (permalink) Old 04-27-2020, 10:26 PM
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Find a source for a complete fertilizer, you are dosing mostly micros. Green Spot Algae in particular gets soft and is more easily eaten by scouring critters if there is a lot of phosphate dosed. Look into dosing Estimative Index - over dose fertilizers and make a 50% water change every week. Week by week you evaluate how plants are doing and increase or decrease depending on what you see.

What algae harassing critters are in the tank? You need at least one that scours and another that nips. Snails, otos, bristlenose plecos scour, platies and shrimp nip. Lots more plant safe herbivores out there of course. I'm feeling extremely smug these days as my tank is close to algae free because several bristlenose pleco spawns are constantly at work. Algae eaters are not a cure but they help if light and nutrients are in good shape.

Keep it clean. Remove dying leaves and run a siphon over the substrate during water changes. Make sure your filter is working well. Remove as much as you can yourself.

Make sure water circulation is good. I've been blown away at how well the ADA type circulation works - return at top, intake below. I get a little pile of leaf skeletons at the base of my overflow and that is it. Chaotic water movement makes for more dead spots which could be CO2 and even nutrient poor.


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post #4 of 5 (permalink) Old 04-27-2020, 11:49 PM
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Quote:
Originally Posted by Mat21 View Post
We feed with 1 capful of flourish iron and one capful of flourish excel twice a week. We change 20% of the water and clean the tank every week but the algae is back in a couple of days.
Dosing Flourish Iron and Excel is not really dosing any ferts at all.

If those lights produce decent PAR, and you are injecting CO2, the plants are probably starving. Starving plants are a magnet for algae.

But that is just a guess.

What plants are trying to grow? Pics of the tank? The more folks know about your set up, the better they will be able to offer advice.
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post #5 of 5 (permalink) Old 07-31-2020, 02:48 PM Thread Starter
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Hi,

I am really sorry not to have previously replied- a very busy few months!

I have attached a couple of photos of the tank and a list of the chemicals we are putting in. The plants still have very thin leaves. I think we need a better clean up crew for starters but advice on the chemicals would be great.
Sorry you will have to cut and past the link to the pics...
Thanks

https://postimg.cc/gallery/3GjX5RD[/
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