Does H2O2 Dosing Kill Beneficial Bacteria? - The Planted Tank Forum
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post #1 of 7 (permalink) Old 06-24-2020, 09:58 PM Thread Starter
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Does H2O2 Dosing Kill Beneficial Bacteria?

I am thinking about dosing my tank with H2O2 for some green hair algae I am starting to get. My question is will it kill my beneficial bacteria I have?

I read that I need to dose from 25 to 35ml per 50L. For my tank that is a 17 gallon I will dose 32ml. I read that I need to dose that for 3 to 4 days straight then give the tank a rest. Is this correct?

My information is coming from this website: https://www.aquasabi.com/aquascaping...xide-treatment
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post #2 of 7 (permalink) Old 06-24-2020, 10:18 PM
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H2O2, in the right amount, will kill just about anything in your tank. IME, using H2O2 at levels that will kill all algae will also kill a lot of fish (I've done it several times). It is much safer to use Excel (glut). Adiscussion going on, right now, about this here: https://www.plantedtank.net/forums/2...l#post11351515
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post #3 of 7 (permalink) Old 06-25-2020, 01:01 AM Thread Starter
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Thanks for the info. I appreciate it.
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post #4 of 7 (permalink) Old 06-25-2020, 05:31 PM
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Quote:
Originally Posted by Deanna View Post
H2O2, in the right amount, will kill just about anything in your tank. IME, using H2O2 at levels that will kill all algae will also kill a lot of fish (I've done it several times).
As have I. In fairness, Excel or virtually anything else in the right amount will do quite a number in your tank too, though I'd agree that surely the LD50 is lower for Excel than 3% peroxide. I never thought of it as safer than the H2O2 but a lot of that comes from shrimp keeping. Funny how the direction we take in this hobby dictates how we see things, much like the parable about the blind people describing an elephant!

But back to the subject at hand, both kill algae and both break down pretty quickly. I mainly wanted to chime in regarding the concentration of H2O2 recommended from OP's link. Personally, I think that's a bit on the strong side. I find that 1.5 ML/gallon of 3% H2O2 (about 25 ML for OP's tank) to be a sweet spot for a tank with any fragile livestock while still being effective. Even at that dosage, I turn filters off for a few hours to protect them. To answer the title question, in a strong enough dose to be effective peroxide will absolutely kill your beneficial bacteria. But you can't expect anything to kill some of the most resilient life forms on planet Earth and not have any other impact.
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Nothing good happens fast in an ecosystem.
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post #5 of 7 (permalink) Old 06-25-2020, 07:20 PM
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Get yourself a needleless syringe so you can target algae without using much. Shrimp & cories are especially sensitive. Probably others too.

Tanks 1-3: LowTech 100 gals/ea - FAUNA: Albino Ancistrus, Red Ancistrus, L333 King Tiger Plecos, Green Neons, Cories, Male Guppies, Neocaridina Shrimp. FLORA: Anubias, Bucephilandra, Dwarf Sag, dwarf Bolbitis, Crypts, frogbit.
Tank 4: LowTech 33 gals - FAUNA: Ember Tetras, Sparkling Gouramis, Albino Ancistrus, Neocaridina Shrimp. FLORA: Aubias, Vals, Crypts, frogbit.
Future Tank 5: LowTech # gals Office Nano - FAUNA: Neocaridina Shrimp FLORA: Anubias, Bucephilandra, Java Moss, Frogbit
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post #6 of 7 (permalink) Old 06-26-2020, 04:26 PM
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This is one of the best tools I've got in my fish room. Ideal for spot-treating, quick cleanup, even feeding.

Maybe my favorite tool all around when it comes to shrimping and rearing fish fry.

Quote:
Originally Posted by LarryMac View Post
Get yourself a needleless syringe so you can target algae without using much.


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post #7 of 7 (permalink) Old 06-26-2020, 09:21 PM
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Also for underwater spot treatment, peroxide comes in small spray bottles that work good too


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