PBass...1-2" / month till about 8-10"
I had a silver aro about a year ago...grew from 5-15" in 6 months....
They are both fast growers if they are fed correctly. Try not to over or underfeed them. Currently I have 10 3-4" Orino PBass that eat 3 chopped up nightcrawlers daily. I clean the tank every 2 days...probably about 30 gallons out of my 125. Water quality will also keep them healthier and grow to their potential.