There are so many variables that can affect a victorian's coloration. Just like Bre, tankmates play an important role. If they are too aggressive and robust for the vics, the vics will fail to fully color and will display dull colors. Just make sure you mix fish carefully and wisely. Adding females will entice the male to fully color and display magnificient coloration. However, having males of the same species will even push the male more to color even better. A second male will act as competition thus the dominant male will always be colored and displaying. Feed them a varied diet consisting of quality foods and occasional treats such as New Life Spectrum, Dainichi, Hikari, krill flakes, spirulina flakes, brine shrimp, etc. This will help bring out the colors of a very healthy flourishing fish. A good environment is always important. Have some rock work or atleast some hiding places in there for the fish, so that they can claim a territory and feel comfortable around their surroundings. Do some little water changes at least a week or once every two weeks to ensure good water quality.