hmmmm, well, I bought it at about an inch and a half, maybe 2 inches and he darn sure doesn't look that size to me now. Don't get me wrong, I am not one of those people who just buys things to let them die or put them in an environment that is not right for them, my LFS is very good and said that 5wpg is enough for this type of clam. I also have a 90 G with roughly 8 wpg MH for things to go to if they ever look unhappy. Just a little caught off guard by your comment as I watch my tank extremely closely and do everything I can to make sure everything is "happy."