I was wondering if anyone would like to share tips on octoproofing a tank with a sump? This is going to be my first saltwater tank, and it will be a long time still before I have it set up, but I want to do things right and I most of all want to dedicate the tank to a bimac. I also wanted to know, aside from pencil urchins and starfish, are there any other creatures that make okay tankmates for them? I've read that some kinds of anemones are okay, but which kinds? And some people say hermit crabs are okay too, but again, what kinds? Any information is greatly appreciated.