Hi, about a year ago i was very inexperienced with fish and polys. When i walked into my LFS they had 2 sens in about a 5 gallon aquarium. They were both about 3 inches each maybe 1/4 of inch more or less. the only difference was the girth. I at first got the skinny one. The LFS said it would be ok to keep in a 20 gallon aquarium with lots of water changes. So i kept that one in there for about a week until i brought the other one (the Girthier one) The girthier one is the one i have to day (he killed the other one) he was in the 20 gallon at about 3 inches. He was about 5 inches 6 months later when i Finally got a 75 gallon. Now he is still about 5-6 inches he has gained A LOT of girth though. But doesn't seem to put any size on. the latest i would have gotten him was about september last year. And with all the experience i was wondering if i could un-stunt him, tell if he is stunted, and if he is what can i do to help him with 2 other friends in a 75 gallon (ornate and beuttikoferi possibly to be joined with others). (he has been in the 75 gallon for about 6 months now and is always first to the food) Anything will help. Thanks in advance Dr.B