I get 6 different aquariums.
1 would get a monsterous 20x5x5 African Bichir Tank - perhaps some top water predators
I would get a 10x5x5 Native tank - a shoal of large sunfish, a pair of smallmouth bass, and some kind of catfish on the bottom
I would get a 20x20x10 Massive Shark tank.
I would get a 20x20x10 Giant Saltwater Predator. Perhaps some tuna (I’m joking)
I would get a 800g tidepool tank complete with a literal wave maker!
And lastly, I would get a realistic tank of 250g with A singular Freshwater Moray Eel