Here’s our new tadpole setup...I have had an old one just like it for about a year now and it works like a charm...I do next to no water changes. Just add some water once a month or so and change the filter. Each tadpole has its own acrylic tray so no cannibalism. This setup has a filter, heater, and aeration and the water stays clean and is never stagnant. Just thought I may let you all in on my little secret. I am in the process of formalizing something for the market. It’s the best lazy man/woman’s tad setup and it will be relatively inexpensive when I get them up and going.