IF you get him small a 55 will be ok for a while. It will just depend on how much you feed him. As far as types go flowerhorns come in a wide variety of colors and styles. Find the one that you like the best and I know you will be happy. Red Dragons are very nice and can be absolutely gorgeous!! I found one FH that I just thought had the coolest color and he has turned out to be quite the fish and one of my favorites. I have him in a 220 with another flower and both are getting huge!! Good luck on your hunt!!