I have a green adult - same patterning/colors on its face but a lot of blue - almost the whole face, plus the striping the original pic of this one had. I've had him for about 3 years...50 gallon is too small IMO - I think 125+, but I could be wrong. I certainly wouldn't put mine in a small tank - sometimes I feel like his 165 is too small for him - he whips around with so much speed, and force. A definite favorite of mine!