I keep them in half water half land. The land is potting mix with fine gravel on top to keep them out of contact with it and grows a well developed miniature fig. The water has driftwood,fine gravel, cardamine lyrata and Hydrocotyle. I feed them mainly in the water but also some fruit flies.I have a small filter and heater in the water but have now turned the heater off as I read they like it cool. I am hoping they will breed next year when about 2 years old.