hi my name is Dave and i am fairly new to cephs i have good look with reef tanks. i also have friends who are very knowledgeable with saltwater systems but know no one who knows a lot about cephs. I currently havea 40 gal bowfront sealed with a 205 fluvial filter 50 lbs of rock top is sealed maybe a 1/32 of ince crack between lid, but all of the lid i plan to seal with duct tape when tank is not "open". I need help finding out what kind of ceph is best i want something that likes water 75-80 (I can keep it on one degree just throwing out a range). I also want one that is not nocturnal . Poison doesn't matter i thought about a blue ring i have no problem taking extra pro-cations i am very used to extremely dangerous pets. Just hopeing someone can point me in a direction. thxs