Help, my bgk doesn't eat as much as he usually do. Whenever I put some tubifex worms he usually hunts for it even with lights turned on. He usually eats tubifex worm cubes, but recently he doesn't like to eat it anymore. I even introduced some sinking pellets, live ghost shrimp, and small feeders, what should i do? He's in a 75g tank and currently ranging from 4-5 inches.