I have a Bi Color. Great fish. They arent as hardy as the flame. Mine is very passive fish. Shows zero aggression towards my clowns or diamond goby. They must have sprilunia in their diet daily. I feed my guy 3 times a day and he has done great. Going on about 5 months now. Slow grower but grows.
IMO the BiColor is a more rare fish than the flame. If you canm get him eating and established its the better choice. Try and get a MAC fish. That way you know it was net caught and not with cyanide.