I've actually seen those for sale in Hallmark stores recently. The care card that comes with them states that they need fed a few pellets a couple of times a week and that the water only needs changed every few months as the gravel "filters" the water.I used to have 8 ADF's in a large filtered fish tank. My frogs would only eat live blackworms or frozen bloodworms (thawed of course). They refused to eat anything other than worms. I also did partial water changes once a week. They were spoiled frogs and constantly laid eggs. I always had tadpoles to care for and little froglets.