I think the tank is clean. Water is clear not a lot of acces to look at but I'm more interested in the fish. I think the fish might need a place to hide or rest but other than that its a clean tank I like it.
That was and is really cool. I hope to do one outdoors where I can walk underground and see into the tank kind of like at sea world. I would love to put a African Goliath Tiger Fish and watch that freshwater monster lurk around.
I would have to say the Dovi for what you are asking. There are other mean fish out there but given your question I would say the Dovi for sure. But that is just as far as legal fish go.