The average store bought Texas will not usually grow more than 7 to 9 inches max. With 9" being really big.
It's rare to get a big 12" texas, or to get one to grow that big.
It's even more rare for a Carpinte to grow those sizes.
I am however not debateing that it can happen.
I'm basing my info on what I researched from Axelrod. While deciding last week whether to go with the texas or the red terror as my new tankmate for my big male JD.