No. There is no possibility of this. When the growth stops due to space constraints, we call it "stunting," which has serious negative effects on the fish's health. And it happens more because of toxins that build up in the water, rather than a lack of physical space. If you're keeping the water clean, then the fish will outgrow the aquarium.There is a remote possibility some or most of the fish wont grow due to the size of the tank itself. I will keep everyone updated.
That's a gator gar as well!! Good luck with this setup