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Does anyone know what that is? I hope it doesn't harm my fish or plants.

I did the same thing with mine but it came back, so I dropped in a gravid Japonica shrimp and she finished it in under 2 minutes ... wow ... a definite good investment.Daemonfly said:I had that on some malaysian wood when I initially put it in my 20g.
I found a quick way to get rid of it. Took the wood out, got a toothbrush & just lightly scrubbed it off with some Hydrogen Peroxide then rinsed the wood off. Never came back.