So I am pretty sure that my bimacs life is coming to a end. So i have decided to try a new species. I want to try out an Aculeatus. Mainly because I want to have an octo and coral in the tank together. I have a few questions about them. Will i need a heater for the tank and what temp of water do they like?(i live in santa barbara california) How do you know if the coral stings or not? How big will these guys grow? I have read that they are smaller then a bimac is that true? Also i have read that if you keep the octo well fed you can keep fish in there is that true? This will be my second octo so any other tips will help. One last question are they diurnal of nocturnal?