Ok..so I used a 50 gallon tank for freshwater for years..then went down to 35 gallon hex tank for freshwater..I finally switched it to saltwater and tried to research as much as possible. I lost a crab who I think got crushed under a rock that never moved??..hmm..a cleaner died..a starfish began losing legs and finally died.. and two expensive tangs..bought on different occassions both apparently got some kind of ich or white spots which eventually killed them. After that I gave up..no fish for like 3 years now. I'm intrigued by the nano tank however and wonder if it is a better way to go. Any thoughts??...anybody???