Hi there! New to the site and was wondering if anyone could tell me what type or coloring variation my 4 koi are. They are all fairly young. The bigger white one being my oldest. I have had it for 1.5 yrs and got it at about 2-3 inches long. He is now about 6 inches long. The rest I have had less than a year and haven't grown much. They live in a 55 gal right now. Of course I plan to upgrade as needed or find them a pond if necessary. I have also noticed that the larger white one has lost scales on his lower sides and am not sure if this is normal or abnormal and if I need to make any corrections to resolve this if it is abnormal. I use tap water for my changes but use stress coat conditioner even though my tap water had never tested for any chlorine. Any advice in either typing the koi and the scale loss is welcome! I am a novice and eager to learn. Please let me know if my photos are viewable to you. Not sure I did it right.