Alright, I've just begun to read up on a starfish that one of the LFS recommended to me: Sand Sifting Starfish. I took their word for it and brought it back and acclimated it, and it's been about 15 minutes of me looking around and everything I see is to avoid them cause they will decimate the live sand bed. My tank is finished cycling, it has been up almost two weeks now, so it's not mature. I had no idea when I bought it (they charged me $12). I don't necessarily need a refund, but would like an exchange... Are most LFS willing to do that? I mean, it sounds like a reasonable thing to ask especially since I will have only had it for a day. Oh, I also bought 4 nassarius snails for my tank (20 gallon) and they are just chugging away; too cool.. although I must admit the starfish buried almost immediately when he first was laid on the sand bed so that was cool too, but with this being a brand new tank and me being new to the hobby I don't want to take a chance.. Thoughts?