This flowerhorn is in a hospital tank after I just got it it got beat up pretty bad. Ive seen him eat a little blood worms before but the other day I but it in and he left it so I think the filter took it up. When I throw food in there he comes up to check it out but the swims away from it like he was hoping for something else. And the previous owner being shady will not let me know what he use to feed it. What should I do? Should I be worried? What to know or think about situation?