Nah I have never put any treatment or die in the tank....Woah thats weird... mine turn brownish if I get lazy but ive never seen blue... it looks like you put pond dye in the water lol
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It is blue green color, definately not grey..Matrix is a deep grey that can look a little blue under certain lighting. The pic looks normal to me more or less like matrix
It is inside an eheim 2262...only gets opened once every few months...looks like algae, or maybe cyano...
does it get light?