Right now it's mid-construction. The first part is dug out in ground with the largest pond liner we could get. It's shallow on one end for them to get out easily. The other end is about 3-4 feet deep and empties over rocks into a second area that is smaller. That is where he's got a bit of a filter and a large pump to cycle the water back to the big part. It comes out the hose and drips off some rocks that are elevated, like a little waterfall to help with oxygen and surface tension. There will be a canal and another much larger waterfall when we are finished. What are good fish and plants? We are in Ohio and would need them to be pretty hardy.