I want to surprise my girlfriend who wanted an octopus but she was outvoted and we decided to do a reef tank. I'm wondering what would be the best size for a tank with just an octopus? It will be plumbed into my system with a 150gal reef with 100gal sump and 50gal growout tank. I did a lot of research a couple years on cephalopods but forgot most of it and was wondering also what would be the best kind for a smaller tank. Also my water currently is 79degrees and I remember cephalopods like cooler tanks. Would this be a problem? thanks for all the help, I'll be sure to make a build thread of the adventure.