One tank that would be dope would be a tank I saw today. I went deep sea fishing, and the place I went to has a massive 10’x4’x3’ they grow out fish for local aquariums such as the Birch Aquarium and Legoland Aquarium. They have a small group (5-6) of small Spanish mackerel, 2 calico bass, 2 Black and Yellow Rockfish, 1 Rosy Rockfish, 3 Blue Rockfish, 2 Sanddab, 1 large Whitefish, 2 Opaleye, a few large crabs, 4 Pacific Sculpin, the cleanup crew (includes starfish), and a baby leopard shark. It’s all native fish. It’s sick. Minimal rock decorations, 2 large strands of kelp, and tons of natural algae and ‘plant’ matter. Didn’t take any pics. Should’ve. It sounds like it looks cramped, but that tank is massive, and most fish are under 1’.