I have an unused, 20 gallon tank (used to watch some tadpoles grow, which we later released into a nearby pond). I would like to do something with it--but I travel a lot, and need something super low or no maintenance. I believe that rules out turtles (which I know can get smelly) and most fish. I am even toying with just using it as some kind of planter. I am looking for ideas that will make use of the tank, be interesting for kids, and be very easy to upkeep. Thanks.
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