A couple months back I attained a 5" gold saum, he ate pellets for the first few weeks. I fed him both NLS and omega one and he ate pretty vigorously. Then all of a sudden he wont eat any of it... I got him some bloodworms and he's been eating that once a week. In between bloodworm feedings he wont eat a thing. No problems with water parameters, all other fish in the tank are doing great. Any tips?