One of my brothers has built his 'up' rather than 'down' if that makes sense, so when i go I can lean on the wall and look down inti it. He had some huge fish in there. have no idea how deep it is.
Fish are relaxing to watch
I agree, I thought about building it up a bit too but i concluded it would make the garden look smaller so didnt bother. I love the fish we have, we have one thats got the most amazing fins.