that black gravel is good only for faders....you shud probably change the substrate wid some reddish pebbles here and there and get a cheery and colorful background or else ur fh might always have that darker coloration
alright I will change the gravel and background but if i leave the gravel and background the same for a year then change it will he automaticly get better color or will the dark substrate affect him and his color for life?