In the not to distant future, maybe in a month, i plant to set up a convict tank. Probably atleast a 20 gallong high, and i was thinking of puting 2 in the tank. I will most likely not put in any other tankmates just to save them the stress. What are the requirements for them to have a healthy environment. Everything from gravel/sand, temp, plants, shy/ like to be out in the open.