I got two small cuttles and an Octo from OctoPets last weekend. I intended to keep them in separate tanks, but as I was aclimating them, my smaller tank busted a filter. So, I put all of them in my large tank (55 gallons) and they seem to be doing well together so far...it's been a week. Wonder if anyone out there has done this before and if they co-exist well in together. I have plenty of reef rocks, PVC pipes and plants for them to hide...just wondering if there are any long term effects. They are all eating well and I get to feed them live crabs, arthropods, snails, clams and hermit crabs that I catch at the beach. Plenty of food for them to avoid attacking each other for food.