I am confused. What are the dimensions of the 300 gallon tank that you have. I see a few on Glasscages.com listed, and I do not understand how the majority of them could not house your Pacu.
I read in this thread that it will max out at around 3'! Even the extreme non-flexible Gar fish I am to understand that width of the tank be >= the length of the fish!
270 Wide 96 x 36 x 17 Tall
300 Wide 96 x 30 x 25 Tall
310 Square 48 x 48 x 31 Tall
In fact the only 300 gallon range tank (TOO!) narrow for your Pacu's length would be the tall special 300 Tall @ 96 x 24 x 31 Tall
WTF? How is killing a fish < 3' better than keeping it in a over three feet in both width and length?
I sure am glad that our judicial system is not as low (or high depending on your perspective) standard of a crew as MFK'rs. Sheesh, I would hate to know that dudes getting caught drinking two beers at O'Learys Bar and Grill are getting mercifully "euthanized" rather than stuffed into a dirty 7' x 8' cage!
Oh heck yea I love my 7 acres and stretching out with plenty of elbow (bobo) room, but if push comes to shove, cage me before you kill me please!