i have this white stuff growing on a few rocks...good or bad
jackri Active Member Jan 6, 2010 #2 Looks like sponge to me -- eats nutrients in the water but if you don't like it you can try pulling them off. Pretty harmless though.
Looks like sponge to me -- eats nutrients in the water but if you don't like it you can try pulling them off. Pretty harmless though.
