if thats the species i think it is...its bad...its a purple encrusting sponge and will cover his rocks in no time and restrict water flow through the rock.Okay this is what Tod had/has, so mines will eventually do that? also if i want to clean under the rock (where it sits on sand) is that okay to take it out of the tank??
here's another question. i was told to do water changes once a month since i got my setup last Dec. Could this be the cause, not enough water changes and sand cleanup? it's a 30gal 2 clowns 1 goby.