Simple to build using existing aquarium.
First we took an existing aquarium and placed a table and small storage tub beside it.
We used a bathtub/sink drain and found a hole saw to match and made a hole in the tub.
Next we placed the sink drain into the tub with rubber washer on the outside.
We cut two short pieces of PVC. One about 2 inches and the 2nd long enough to reach inside of the fish tank.
We also place the hose coming off the pump inside of our PVC so there would be no leaks.
We got the 158 GPH pump at Harbor Freight on sale for $7.99 and the hose at Lowe's.
We used a "wire" pot and cut out the center.
Put the hose through the pot and pushed the pot into the drain to prevent the rocked from entering into the pipe.
Then we run the hose to one corner and filled with lava rock, that we pre-washed, and tested for leaks.
We got our hose/pipe connected at Lowe's in the yard sprinklers for 25 cents.
The pipe and coupler came from the same section.
We put 5, 1/4 inch holes in the pipe and had to enlarge then to 9/32.
Make sure the pipe is level or all the water will run out the end.
Now we are ready for planting.