what is that this? i’ve some java moss that got here from my tank (no inventory simply crops to date however may have shrimp) in a wine…

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  1. Protein film from decaying plant matter and bacteria build up. This is what happens to stagnant water.
    Not harmful unless you need anything in the water to have oxygen exchange.

    Just keep the water moving and it won’t form.

  2. It will eventually suffocate the Java moss. The surface scum blocks the gas exchange. Give it a little water change.

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