| Re: Anyone know what this is? Thanks Boomer. How would it get there? I haven't changed anything in the tank and the rock it's on has been there about 3 yrs. It appears solid because it had no siphons on it, but at times it looks like it "deflates". I figured it was dying but the next day it's back to normal. It's towards the back of the tank and about the size of a dime. |