I got a free one from this site for ordering stuff, I had it in a 10g QT with live rock wasn't sure where I was going to put him yet, went to work he was a happy little guy, came home couldn't find him......there he was on the back side of the little filter I had in the tank. Wow was I surprised, I felt SO bad, but luckly I didn't have anything in there but him and the LR. I picked it out not thinking also and did have a couple of places that stung a little.