I have had mine for less than 2 months. Went from 3 1/2" to 10" already, but I am kind of a person who loves to grow his catfish large and in a fast manner. I fed him freeze dried krill for the first month, and now I am feeding large chunks of prawn with ocassional worms from the bait store. Also ocassional minnows that have been quarantined for 2 weeks to check for desieses! I treat my feeders with melafix or primafix depending on how they look, and fatten them up for 2 weeks before feeding them. lol. I also do 2-3 50% water changes per week depending on the nitrate levels. He's in a 45 gal hex right now, and will be moved in the next two weeks to a 125 gal. He grows faster than any other(many) large catfish I have ever owned. Good luck. Mine will end up in a 350 gal pond within the next year to year and a half, and eventually will go into a 2500 gal plywood aquarium that I am planning for in the next five years. Good luck!