what is the point of asking when you ignore everybody's comments that it is a bad idea? An alligator gar is very aggressive and territorial. It has a nasty temper most of the time. Even in my 280g tank with just a few bichirs, a 6" alligator gar snapped at them in less than an hour since introduction to the tank and I have to bag it and return it to the LFS.
My Alligator Gar is 33 inches and lives alone, he too started out at 3 inches. Might as well set up as big a tank as you can afford, keep him by himself, and watch him grow!
Given the growth rate and temperment of a gator gar, you will likely end up with killed or eaten tankmates. Even as just a grow out tank it is a bad idea.
Given the growth rate and temperment of a gator gar, you will likely end up with killed or eaten tankmates. Even as just a grow out tank it is a bad idea.
I don't keep gator gar but as I see a lot of gator gar around me I would say young gator gars are almost impossible to keep with other fish, especially in small tank! Big gator gar might be fine with other fish in a huge tank, but that still a risk!