I have 2 small ( 7 gallon). Ponds in the backyard for frogs,rabbits,birds,etc. Also a 1/2 barrel pond with rocks and water plants. Now thinking of a small inground,around 50 gallons at the back of my sunroof. The sump pump pipe empties onto the lawn. I'm considering butting it here. The overflow will clean it out and spread the water around at the same time. Trying to come up with a cheap container idea....any suggestions?