Thank you all for the info. I am learning about ATF too.
There is another recent thread here where people discuss GATF growth. There is a strawman proposal that there are two kinds - fast and large growing one and the opposite. I don't know if I buy it but having a puny experience myself, I am listening to all and learning.
The fast growing ones IIRC have two examples - Ariberto's 40" 4-year old and Greenerink's 22" 2.5-year old. So your 17" 2.5-year old is not too far off.
But it appears (and the reasons can be many) that most of the GATF people report on MFK grow ~2x slower if not even slower yet. I am not talking about the initial growth over the first year but overall growth over the years, meaning that for an average hobbyist GATF, it would take 5 years to get to (Greenerink's) 2' and 8 years (if ever) to get to 40" (Ariberto's).
PS: Haha, it's actually my thread.
https://www.monsterfishkeepers.com/...atus-african-tigerfish-16-in-4500-gal.683787/