Ah ok, I don't really have the means to cure it out of tank, so that's out. Thinking of tossing some chaeto in there instead, since my tank is barebottom and oriented sort of peninsula style the light goes through the bottom of my tank and through the slot where the return and overflow was supposed to sit originally mid tank on my stand and lights up my sump somewhat, so I wouldn't even have to get a light for it.