Kinda like the title reads, I have a 40G with a 30 sump, almost exclusively SPS tank. Am looking for more fish to help feed corals with waste, but tangs and other long range swimming fish are out due to tank size (though I had an amazing smaller purple tang in a 40g that I got from petco for $100 and kept for a couple years before I sold the livestock and tank and moved.) I've had a tailspot blenny in every tank (ecsenius sp.) just wondering if anyone else has had success with multiple blennies in a smaller tank of the same species. I'd love a midas, but worry that the tailspot and midas are of same family. I have a yellow watchman, and will probably get a pistol shrimp and another goby paired, any worries there? Any other ideas for fish for a smaller tank, am looking at a candy hog, a hawkfish, and a fairy wrasse (have a carpenters flasher now.) Let me know, but any ideas here in the reasonably priced range are appreciated.