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Discussion Starter · #1 ·
I need help identifying a black growth on one piece of LR. Two pictures are to follow. The growth is very slow but seems to eventually want to cover the entire LR. The white spots are not bubbles, but sand. I have tried vacuuming and scraping. This stuff does not want to come off. Any ideas what it is? Do I want to get rid of it? If so, how?

Thanks for your help!!!!
 

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I have what looks to be the same thing in my tank, feels like a sponge and peels off very easily (mine does anyway)
 
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