the tank is kinda small, just 80gallons or so.
The 5 gars are 4-5inch.
I hope they´ll grow fine, even if the tank is un-heated.
Before I had them in a bigger tank with longear-sunfishes but the beasty gars started to attack them
The sunfish were impossible to eat for gars but they allways tried.
LOL. those are really nice gars. I did the same thing (fill the grow out with feeders) but they dont grow any faster... just get fatter... also it will not help if you are trying or in future want to switch them to packaged food. good luck.