most common pbass grow fast. all fish grow at different rates depending on a good number of factors.
the top 3 for optimal results
1.- feeding, powerfeed 3x a day, pellets, feeders, earthworms, etc
2.- tank size- BIG and soon
3.-water quality- constant WC's, major filtration.
master all and you could see slightly faster than 1" a month when small, and with all fish growth slows down as they get bigger so don't expect tems to grow 2" a month at 36".
any ideas what species you have. if you have common pbass most likey fish are
mono's
orino's
and
tems
mono, and orino are simalar in growth rate and max size, tems are faster and large growing bass.