seapug
Premium Member
+1 on the Cardinals. They are probably the easiest of all marine fish to breed and raise the young (supposedly as easy as guppies). They are also generally easy to care for as adults. Plus, they are very endangered in their natural habitat so there's something a bit more "important" you can teach by breeding them. You might even be able to give them to a local store in exchange for dry goods (salt, food, etc.).