I've been mauling around this idea around in my head for weeks so I finally decided to start it. I found a three compartment coin operated candy machine and I've decided to turn 2 of the compartments into goldfish or betta tanks. There is plenty of room in the coin drawer for a air pump and I will use 2 small led lights for viewing. These are maybe a half gallon or so. Thoughts on a good fish for this project would be appreciated because I have always delt I'm tropical planted tanks. Here's some pics of the machine.