@JK47, they're slow growers. Mine got to 6" in a year and 5 months. I did frequent water changes(3-4water changes a week, 30% each time, sometimes 50% if I was bored)
Nice. I absolutely love firemouths, but their temperaments vary very much. I had 1 that stood his ground and picked fights with my breeding pair of cons, and another one who got killed by my breeding cons in a matter of minutes.
Makes me wish I wouldn't have given my firemouth away to an LFS worker. He was a big boy. Constantly picked fights with my convicts, and never backed down. Refused to be stuffed to the side of the tank.