Most gars, like the one usually called "needle -nosed gar", Like colder water, closer to 68F. MAKE SURE YOU KEEP THAT LID ON!!! It also might not hurt weight or strap the lid down. I say this because I actually found my gar half in, half out of my tank. He actually hit the glass lid just right, and with enough force, to get through it. Half-way, anyway.