I put a standard 29 gallon in an existing "window" between my living room and kitchen.
Difficulty is working in the tank, not a lot of head space, T5 and LED take up a lot of what space I have.
It is sumped. Sump is on the kitchen side framed in next to a cabinet. The plan is to redo the counter top and add driftwood or barn board to the kitchen side of the tank.
Getting the right flow is challenging, no space for magnet power heads on the side opposite the overflow so all my flow comes from the right side. I may be able to hang something on the left, just need to run wires and build hangers.