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I think Tonysreef has it right. I have loads of them in my sump and on dark spots on my live rock.
Long ago my two perc's went missing.. I assumed they had died. After lifting some rock out of the tank to see if I could get there dead bodies out.....
You may get serious algae blooms having the tank so close to the window.
How about a long nose hawk fish?...
I once was moving the live rock around and got a load of micro hairs stabbed into my fingers from a stomatella snail, That made my whole hand swell...
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