H2O2 and shrimplets - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 01-03-2020, 04:39 AM Thread Starter
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H2O2 and shrimplets

The thread algae issue in my mayaca doesn't appear to be a nutrient deficiency; it's in an area with no canopy of floating plants, so I presume it's related to too much light. The fixture has been reported as 28 mMol at 12", which is at the upper end of low light as I understand it, so I'm not completely sold on that being the cause. Manually removing the algae is a bit too time-consuming and damages the tiny leaves too, so I'd like to try H2O2 spot treatment before replacing it with something more robust but typical, like rotala rotundifolia, for example, or vallisnera.

Is there a consensus on the best way to spot dose a tank with new shrimplets tiny enough to hide in the Mayaca? What the appropriate dose for a 7.5 g tank with mini-pellia, moss, and snails? Filter on or off?

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post #2 of 6 (permalink) Old 01-04-2020, 02:25 PM
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Filter off. 2-3 drops at a time. Have a tube or hose to immediately remove it as you add it.

That's not a failsafe but it's the best you'll be able to do in order to mitigate impact to shrimp.

Could you post photos?


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post #3 of 6 (permalink) Old 01-05-2020, 12:05 AM Thread Starter
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Something like 0.1 ml total, essentially doing one small spot per day? I'd be willing to uproot it all, shake out all the shrimplets, blitz it in a diluted H202 bath, rinse, and replant if that would be likely to knock it out. I don't imagine that would be more than temporary though.

The algae is present in clumps down to about 1/3 of the tank. Dosing is Salty Shrimp GH/KH+ at WC and 0.5 ml of Flourish Comp twice a week and a small amount of K2PO4 as needed. Photoperiod is ~8 hrs.

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post #4 of 6 (permalink) Old 01-05-2020, 11:01 PM
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If you wanted to spot dose it, I would recommend using a syringe to do so. In small enough amounts, I can't see it being an issue, but I've also never had any major algae issues to deal with that would warrant using H2O2 or something else.

You can certainly remove the plant as well and treating outside of the tank - as long as the plant is able to handle the treatment. (I know most plants usually can, but some mosses can't)

You might also try upping water changes and setting your light on a timer so it comes on for 3-4 hours, off for 1-4 hours, and back on for 3-4 hours. Might help?
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post #5 of 6 (permalink) Old 01-06-2020, 10:54 PM
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Agreed with the advice already given. You definitely want to be super careful with h2o2, I recently crashed a tank with it :/

Have you tried a blackout cycle yet?
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post #6 of 6 (permalink) Old 01-07-2020, 12:16 AM Thread Starter
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@JoT Not yet; it's the last resort. I've always used a 72-hr blackout period but recently saw a site recommending up to several times that. How long do you do it?

@Zoidburg mentioned upping the WCs. I usually change out 1.5g; at what level does it become a problem in a shrimp tank?

The algae is now down to just a couple inches off the substrate, so now I wonder how it can be (just) a light issue. The fixture is only 28 mMol @ 12"...

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