These things are great, can be for much more then clams, as they are with my tank! I have a branching frogspawn I got from eingals in one, and a frag from one of my Hydnophora that has gotten out of control. Perfect place to toss a small frag and keep it away from those little hermit crabs that love to knock over everything new in the tank hehe.
Thank you for making them, and the price can not be beating!