how long have u had that pleco? i dont mean to offend anyone by saying what im gunna say but stunted growth never hapend to me ive kept my oscar my red devil and my jd in a 33 galon for 3 years until i moved them out, my oscar was 8 inches my jd was 7 and my red devil was 6,since i moved them last year my red devil grew to 9 inches my oscar grew to 13 and my jd grew to 10,so this stunting of growth thing i dont realy belive in,its just cruel to the fish because he doesnt get much room to swim.