Hi there MFK, I about a month ago bought a 3 inch ornate bichir and have been growing him out in a 40 gallon. He is about 4 inches now and I was wondering when I should move him into a larger tank to avoid stunting his growth? I currently have a 55, a 60, and a 75 that have the availability for his next stage in the grow out process. His next to final stop will be a 125 gallon tank for a while, when he outgrows that he'll be in 240. Thank you very much for any responses!