Lately, iv been looking at numerous equipment lists on the internet fro keeping a pet octopus...and god......there all different from one another. Some are 2,000 dollars all together, and others are cheaper. And most of them require much, much, much more stuff than the equipment list shown on this site. Is that normal, or...is it just excess stuff you dont really need unless your serious?? Iv seen "sumps" a lot on equipment lists for octopus but not on the equipment list here. What's a SUMP? and what's the purpose of it? What will happen if I dont use a sump? And what will happen if I ONLY use the equipment I see on this site? Tank Aquarium Hood r/o water aquarium salt hydrometer live sand filter Protien Skimmer Test kits heaters chillers air pump lighting thermometer if I use ONLY THESE SUPPLIES including coral and rocks...will an octopus survive or do I POSITIVELY 100% need a SUMP? ThanX you guys. This is the best octopus forum for keeping an octopus in captivity. note: My grandpa and my family used to think it was illegal to keep octopuses in captivity...lol...I guess there wrong.