I would say that the more important factors are to keep up on your water changes to maintain the highest quality of water you can and to watch their diet. Do not over feed. It seems that they have sensitive digestive systems. Stick with a high quality flake and pellet and don’t go switching things up all the time. I like foods with a good amount of spirulina. It is an easily digestible plant based protein and is a natural color enhancer for greens and blues. The only “treats” mine get are frozen brine shrimp at the most twice a week. I believe the little crustaceans are high in roughage and pass through the digestive system well.