Hello all. I'm new to this forum so I'd first like to say it's nice to be here and thank you in advance for your support. I'm planning on putting together an octopus tank and want to do it right. I've kept reef aquariums for many years and have had much success keeping just about everything but an octopus. I broke my 200 gallon reef system down a few months back and now that I'm settled in my new town, I'd like to set us a smaller, well-designed system for an octopus. I'll keep looking around the forums but had a few questions first: 1. What species would be recommended. I'd like something that stays relatively small but is diurnal. 2. Is there any particular tank size or dimension that is recommended (long vs. tall, etc)? 3. what is the most effective way to provide filtration and an escape-proof top. I'm thinking a drilled tank with a sump and a nice skimmer. I think I could then find and use a locking plastic top designed for reptiles....but I'm a bit worried that most of these have metal that would not do well around saltwater. 4. How should I decorate the tank in such a fashion that makes for a comfortable home for the cephalopod but also promotes good viewing. I am thinking a small amount of live rock with perhaps a pvc hiding spot or something like that. All thoughts and suggestions from experienced octopus keepers would be welcome. Thanks!