My pygos grow fast for 15-18 month ,up to around 15 cm ( 5-6 inch).
After that, when they reached to "adult"state, with ca 15-18 cm, the progress slow down.
My P's (cariba, natterei) grow up to 22-25 cm (9-10 inch) in 3 years, and the growing nearly stopped after that.
My Piraya are around 1 year now and up to 15 cm , don't know what's going on with them in the next time, but the growing-rate becomes slower.
