I have this stuff growing in the fuge area of my sump. Some kind of macro algae? Maybe chaeto? I have never added anything. No lights down there. Just growing on its own.
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Looks like chaeto to me.
Did you vinegar bathe or clean out the sump/returm pump? Might have still been in there from when I picked it up.
Mac
A compact fluorescent in a clip-on work light, and you'll have a chaeto farm in no time... and pods for a Mandarin!
Mac


