Can anyone tell me what the big white thing with all the branches is? I'm suspecting some type of sponge, but I'm not sure. It seems to have a texture like foam -- soft but not not squishy. It breaks easily, when I'm trying to clean the sides of the tank.
Is it a good thing or should I get rid of it?
GBose
Is it a good thing or should I get rid of it?
GBose