I keep finding cheap sponges and they are by far my favorite reef organism to observe, but I understand they are very difficult to keep in Aquaria. I don't want to buy one and only have it last for a year, I want the same sponge as a center piece in my next tank build, and the one after that. I guess what are the keys for success for those of you have kept them for 10+yrs? What have you found to be the best diet, or is a well established reef tank sufficient to feed a small sponge with free-floating organisms?