Tems are the fastest growing of all the Pbass IME. They can easilly exceed 10" in the first year although in time they fill out and lose that long lean look and take on the apperance of other Bpass.
Mine have gone from 5" to 14" in 7-8 months.... I generally "powerfeed." With cichla powerfeeding is more like normal feeding for them. Especially when you keep them at 84*+, which most of us do.