ANSWERS: 2
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you missed the toilet again, try turning on the light next time
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Brown stuff? Could be algae, could just be crap building up soon to turn into a nice purple, the beginnings of a healthy new tank. If its in the substrate then clean it up But if its growing on your live rock let it be unless it turn into hair or bubble algae but do not pop the bubbles. It will soon turn into a nice purple hard algae called coralline algae(good). If this is a tank that’s been up and running for a while and this is just know happening, maybe do some vacuuming and a little more inside take work, don’t feed so much, smaller more frequent water changes ect.
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