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Old 12-10-2020, 05:50 AM   #1 (permalink)
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Default H2O2 Dosing

What is the recommended dosing and process for using H202 for algae control?
Is it as simple as adding x amount of H202 to the tank or more of a direct method using a dropper and spraying directly on the algae?
Thank you
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Old 12-10-2020, 06:19 AM   #2 (permalink)
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Default Re: H2O2 Dosing

The best effect is to spray or dip the algae while it’s out of tank water. If the algae is on the plant don’t expose it longer than 20 seconds or it will hurt the plant. On equipments and hardscape, the longer the better.

2nd option is to inject Directly At the algae while in the water. Leave the filter off for 30 minutes to an hour. Don’t exceed more than 1.5 ml/ gallon.

3rd option To dose the entire tank while the filter is off for 30 mins to an hour. Don’t exceed 1.5 ml/gallon.
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Old 12-10-2020, 10:15 AM   #3 (permalink)
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Default Re: H2O2 Dosing

Be aware that dosing the entire tank (I have done this before) may knock back some of your plants heavily ("softer" plants, as opposed to thicker leaved species).
I definitely agree with mistergreen that the best way would be to remove the affected specimen (object) and treat is separately, if that is feasible.
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Old 12-10-2020, 04:32 PM   #4 (permalink)
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Default Re: H2O2 Dosing

Thank you both. I gave this a try today. I dosed H2O2 using a medicine dropper right onto algae areas with filter off for about an hour. I dosed total of 50ml as this is a 40G tank.
How many days should I continue this treatment for?
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Old 12-10-2020, 04:56 PM   #5 (permalink)
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Default Re: H2O2 Dosing

Wait a few days, the algae should turn red and die. If not, try again in a week. The H2O2 does hurt the filter bacteria a bit. That's one of the reason you turn it off for a time.
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Old 12-10-2020, 04:57 PM   #6 (permalink)
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Don’t repeat. Give it a couple days to see if it worked. The algae will start to turn red and die. The exception is BBA, which takes a couple more days to see if it was harmed.
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Old 12-11-2020, 09:35 AM   #7 (permalink)
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Default Re: H2O2 Dosing

Sounds good, I'm going to wait a couple days. I did notice that my amano shrimp are suddenly eating BBA that I dosed, they weren't touching it before. So hopefully it's working.
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Old 12-11-2020, 09:58 AM   #8 (permalink)
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Default Re: H2O2 Dosing

Quote:
Originally Posted by George0211 View Post
Sounds good, I'm going to wait a couple days. I did notice that my amano shrimp are suddenly eating BBA that I dosed, they weren't touching it before. So hopefully it's working.
Yes, the BBA is dead and the shrimps are eating it.
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Old 12-22-2020, 11:03 AM   #9 (permalink)
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Default Re: H2O2 Dosing

Well, it seems to be coming back again and in force.
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Old 12-22-2020, 11:11 AM   #10 (permalink)
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Default Re: H2O2 Dosing

Scrubbing, syphon the debri and H2O2 the spot helps.

Fix your other issues too like too much micros/iron, light, CO2. If you have mulm in your tank, clean that up helps also clean the mulm out the filter.
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