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did my duty and went all through the faq's first. some of my live rock is as old as three years and all very corraline (except underneath). all of a sudden i am growing what appear to be sponges. they are on two rocks and opposite ends of a 125 gallon tank. one rock seems to have them growing...

husband usually empties skimmer cup. i know he hasn't done it in a while (at least two weeks). i just checked and there is no skimmate in cup. therefore i have apparently been running without collecting any skum. water quality and clarity are great. what's going on? is all the live rock doing...