I have a little common/comet goldfish ( I would estimate 2 1/2 inches) living in a 115 gallon aquarium. It has enough filtration for a 200 gallon. A close friend of mine won him at a carnival, then decided she could not take care of him so he was brought to me. I got him last June, and he was been living in the 115 gallon for 10 months. Though, I have not seen him grow at ALL. It has been a year and absolutely no growth. Recently I added a second goldfish to the 115 gallon, and this one is already growing in the short time I have had it. So now I am concerned about the one who hasn’t grown in a year. Was he so severely stunted in the short time he was at the carnival that he will never exceed 3 inches? My new goldfish is pushing 8 inches, with room to grow. I would be very sad if the 2 1/2 inch goldfish never grows again. Thoughts? Is the 115 gallon too small for him to grow larger? He looks soooooo small in it.