To get back to GTOs comments, I believe there is a huge difference between pure "need" and what would be recommended. Realistically, your 24" pbass only "needs" a tank that is roughly 30" long and probably 12" - 14" tall. However, I think we can all agree that keeping such a beast in such a small tank would be a disgrace.
A more appropriate way to discuss fish requirements in regards to tank size would be to use recommended tank size. I don't think most people would recommend a 210 for raising pbass to adulthood. Obviously it can be done, but I personally would always err on the side of caution and recommend something larger.
I currently have my 2 10" monocs in a 200 long with an 8' x 2' footprint. I think it is a great size for them now, but I would feel uncomfortable with them in this tank once they surpass the 15" - 16" mark. I could keep them in there longer, but I like to see them have lots of swimming room. Therefore, by early summer, I will be building them a 10' x 4' x 3' tank so they will have a little extra elbow room when they are larger.
Because the "rules" of keeping fish and aquariums is so heavily opinion based, you should be careful how quickly you accept someone's advice, and also on how quickly you disregard someone's advice. Just because you were able to succeed in a manner that was contrary to the advice you received, doesn't mean that everyone else will. One success does not a rule make. Therefore, just because you or others have successfully raised pbass in "smaller" tanks, doesn't mean that smaller tanks should be recommended.
