You'll be surprised how much these fish will still gain in body growth when they are kept in bigger tanks especially when the stunting factors are eliminated and proper care provided. Some of your fish don't appear stunted to me. The eyes being one of all the body organs that grow quickly and the most noticeable of all indicators, look rightly proportioned with some of your orandas and the black moor. A high protein based diet and plenty of water changes will allow them to gain a lot of growth spurts.