If you want to try again with a clown, go ahead since there is nothing that you did that was obviously wrong. Try to feed every day though, just a little bit is enough and they will find it on the bottom. You may want to get a chromis if you are worried about the cost of the clown, since it could die again, not likely but possible. Also, I would get some hermits if I were you. They will eat the leftover food so you don't have to worry as much.