Good water and good food are the best way to improve the coloration. Good food items include bloodworms, market shrimp, krill, NLS, azoo, hikari bio gold, ching mix (CM) and Grandsumo (GS)
CM and GS do not have harmful hormones and they can be safely fed twice to thrice a week. many people including me feed GS and CM once every day to FH....
Water changes should comprise of atleast 40% water changes once in 7 days and good filteration..
ofcourse it is a low gread fish but it is ur's girl friend gift, so it is a bueatyfull,
feed him beef nd goat heart, fresh prawns, high proteen food, what food du have availability foods.