Algae
Been there, that is pretty much how I inherited my first tank. I use to wash the rocks off in the sink with a toothbrush and the water change water. Got 20-30 crabs a lawnmower blennie etc. The thing that went through the most algae though was when I got a yellow tang. He literally ate off a rock a a day. took him less than a month and he emptied out my tank and started on the pulsing zenia.
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