I've had my bala, and an albino rainbow shark for about 8 months now, they also are with a tiger barb that's been in for about 3 months, and an unknown catfish that I took in 2 months ago. First off my bala is perfectly healthy, he has great coloration, and has survived outbreaks of ich in my tank. But he never eats off the top of the tank.... he will eat off of the bottom only. A good friend of mine who knows a lot about fish gave me some black worms, I think they were, and told me that my bala would eat them up, sadly the rainbow shark ate all of them... I would like to introduce a variety to my bala's diet, but he will only eat sunken flakes, any suggestions?