The best tank set up I ever had was a 20 gallon long unheated tank(there was a heater set at 65F just in case) with a bubbler down the whole back to provide more water movement and as such more oxygen. Most of the time I kept two filters on it also to make sure the water was super clean. Lots of rocks with algae and plants. I kept white clouds with them for dithers. They are well worth setting up a special tank for them I had had them almost three years and there were nine. I just lost all of them during a recent move.