My Oscar is a good fish. He will continue to live in a ten gallon aquarium for another month until his new larger home is set up. Then him and all of his tank buddies will move to their new home. He is 4-5 inches long. He lives with a jeweled cichlid, and a red finned blue botia and 3 mystery snails. I change 40% of the water weekly and feed him three meals a day. The first 2 meals consist of goldfish pellets now that the Oscar Grow pellets have run out. The last meal of the day consists of more pellets and either feeder goldfish or earthworms. He is a tiger oscar however he no longer displays any of his original colorings. He is almost totally gray with a few random red scales. What can I do to make the colorings more predominate?