My girlfriend came across a 5g tank at a yard sale and it's super clean and has the hood, a small air pump, and a big external filter. However I don't know what is suitable for such a small aquarium, and something that she would like. I was thinking some guppies or tetras, but not sure how many I can put in, but it has a filter almost the same size I have on my 29gallon. A planted tank would be nice, don't want to spend the money on the lights required for live plants... I know she's picky with fish and thinks most are ugly. So yeah looking for any input about what all can be done with a 5g.