Hi, I have a new 20 gallon tank that I set up for thin stripe hermit crabs that my nephew brought home, and I’m trying to get the parameters stabilized and over the new tank hurdles so that I can add some soft corals. I tried sponges, but it turns out emerald crabs eat them . So now I’m dealing with bloom of some kinds… good times. But I’m very excited, and hoping to get a 40 gallon breeder tank for Christmas!