I've been having some issues as well with my tank at work. I had some green stuff growing on the sand, but it eventually went away. However, after that I seem to be having a brown smag growing on the glass and a small film on the rocks. THe sand bed did get hard, however I have been moving it around. I don't have fish, just 2 hermit crabs and some corals. It's a 10 gallon. I'm anticipating that I have dinos... I've been trying a bunch of things to rid of it, but so far no luck. My corals look good, the acans are spreading, but the zoas aren't doing a thing.
I had a 20 gallon at home that never had these issues, so it's unfortunate.
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