Okay so this wouldn't be for awhile, I'm more so just interested at this point and I'm considering cephs down the roads because of how awesome I've always found them to be. To start I've had a few years in reef experience already along with a decent amount of research on cephs in the past already. My main question is what is the smallest ceph(being octopus or cuttlefish) that is commonly kept in the home aquarium? I would want to make it as simple as possible with the smallest tank possible(I don't have much room). I do understand cephs have special needs and require perfect water making good equipment and all a must. I have a PAR38 bulb as well, and this may be a stupid question, but are there red PAR38's that would support corals and at the same time allow nocturnal cephs to hide less? Once again this is no short term project, I want to make sure to have everything right before doing anything.