I feed mine on live brine shrimp nuplii and occasionally microworm and daphnia. I keep them in seperate containers where each lot are within a week to 10 days of the same age and completely change the water every 3 days. Then feed whiteworm, daphnia and bloodworms after about 2-2.5 months. They are pretty hardy once morphed. Keeping fire-bellied newts is a good and cheap book worth getting and is relevent to New Zealand.