Hi, I have 27 of these F1 altum. Bought three dozen and successfully keep 27 of them. plenty of drift wood in the tank to keep the water acidic. Also very sensitive to chlorine, cause when i do a water change straight from the tap, I will lose 1 or 2 of them (that's how i ended with 27, hehehe). Thus water change for me is usually from the tap to a bucket, add chemical leave for about 15 - 20 mins them transfer water to tank. Feed them daily with frozen bloodworms or minced prawns.
Gravel to be dark color to bring out the browness in them. My father kept some in white gravel and his looked like discoloured alutum.
Good luck. Beatiful fish to own...