Is there a supplier of these artificial sponges that can be accessed off the net, and one that is totally trustworthy not to poison the tank? I remember that poor gal who lost 11 horses over night after putting an artificial coral in her tank, so the idea scares the crap out of me. I had another idea, I found a coral supplier that has big pieces of staghorn acropora skeletons. They are stark white right now, but after time they will grow algaes etc. He emailed me a couple pictures of some, and they are awesome, they have the shape of a tree with tons of branches, and he has some pretty tall ones. I just wonder if they are too scratchy and I might need to sand them smoother or something. I took the sponge out last night and put it in my daughters tank, which isn’t skimmed, but it’s a newer tank, so I’m not sure it will do much better in there.