So far all he eats is frozen brine shrimp and frozen bloodworms. Frozen mysiss srhimp is tough anc go. Tried about 6 different foods from pellets to flakes, refused all of them. I understand he is a carnivore. I have no access to live food. I want him to have a varied diet, so aside from what he DOES eat, which I listed above, what else should I try?