giving the jag a bigger tank will give you more to work with as far as keeping the water clean. try to get your hands on a 75 gallon wether u buy it new or not. 75 gal is perfect for even a huge male (no tankmates). obv a 125 would be more than ideal but if you cant do it don't go crazy.some guys on here go nuts and want tell you you gotta buy a freakin house for these fish but its all smoke. if you really know what your doing you can pull of a minimum tank size for the fish.