I'm looking at buying a new tank..or 2..1 for octo and 1 a larger reef. For the octopus tank I see size recommendations for gallons but I was wondering what the best shape would be. I've been looking at tanks from 70-110gallons all in different shapes i.e. cubes, ones that are considered tall, and I was wondering what would be the best for an octo tank. I was thinking that length and width would be more important than overall height but wanted to see what you all thought.