Cheap 20 g tank. Any stand. $10 amazon submessible light. Pvc hiding spots. Cheap heater. $30 fluval filter. Mollys left in to keep tank cycled. Not for viewing so put somplace nobody sees and let algae run wild. The $10 light on a cheap timer will grow the stuff and help filter water and feed herbivore fish. Hardly any maintenance. Once a week water change, top off with dechlorinated tap water. Peice of cake.