This is important too. Petsmart/Petco don't really have the setup to keep otos happy. We don't have any LFS in my area, so I don't have any choice but to shop there. The Petsmart down the road doesn't clean the glass in their Oto tank in an effort to give them a food source, I don't know how well it works. I waited until the day before the new shipment came in to get my group and they all survived and are doing well. If you're buying from a local store instead of a chain, they may be able to take better care of the otos from the moment they arrive...I think the first step for getting them to survive is getting a good source, or at the least making sure they have been at the LFS for close to a week so that the stressed ones can be weaned out..