I think the load distribution is fine. That’s how I set up an aquarium as well and also of a similar size. The load is distributed on 8 feet in our case. Part of the side rests on supporting beams.
Whoever is unsure about setting up an aquarium here should also consult a structural engineer. There's no point in constantly being afraid that something might happen. My wife also had great concerns, so I had a structural engineer come. He gave us good advice on how to better distribute the load. Now we are all more relaxed and enjoy the aquarium.