Whoa, 5x dosing is extreme. I've killed a few fishes and moss with a little over 2x.
I've given up on fish as algae control. As they grow older, they depend on fish food and leave algae alone. The best algae controllers are snails and shrimps. I hear amano shrimps are the best and they'll eat BBA too.
Be careful how long you expose the leaves to excel, peroxide, bleach. I find over a minute will melt the anubias leaves over a few days (not immediately). I expose it for like 20 seconds and wash it off. Peroxide is safest and cheapest.
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