My 1.5" fei feng just bit the big one, he looked like he was eating, but there is no way he was, he was all skinny and sunk in. I feed an array of food to all my fish, including blood worms, earthworms, different fish, market shrimp, peas, freeze dried krill, flakes, sinking and floating carnivore pellets, algae wafers, There was even algae on the driftwood for him. What was I missing? Thanks.