If you have raised bed planters, you can build an aquaponic pond at an elevation lower than the raised beds. It's a fairly simple process. My pond was approximately 12' long, and 4' to 6' wide, as it was kidney shaped. I dug the pond by hand to a depth of 3'. I used about 2 yards of "road base" gravel which equates to a depth of about 6", and hand tamped to form a flat stable surface. Then I spread a 4" layer of play sand over the top of the road base. I happened to have a swimming pool liner which I laid over the sand. All that may not be necessary if you have clay substrate, or you could use a layer of quick set concrete, and spread sand over that before it dries. Then, I built a wall from discarded bricks 2' above ground level. I added a pond pump which pumps water up to the raised beds, and added 1-1/2" PVC pipe as drains from the raised beds back to the pond. I put Tilapia,, and Perch in the pond. The fish poop acts as fertilizer for the plants, which in essence returns clean water to the pond. It worked great. But winter hold over required a heater for the pond, so the fish became food for my neighbor, and his farm animals. I just replaced the fish in the spring. The veggies, and flowers grew fantastic, and tasted great.
It was very relaxing to sit by the pond watching the fish swim around the pond. I'm not sure how many fish I should have added, but I had 8 raised beds 4'x8' and added 20 perch, and 16 Tilapia. No rhyme nor reason, but no fish died, and the plants grew abundantly.
