Pets again?

Remember last year when my boy got soo interested with fish? Me and the dad went to the pet store that weekend to get him an aquarium and some paraphernalia. It was fun being there , my son had a great time looking at all those fishes of different sizes and colors. I remember we even got some pet supplements as advised by the pet attendant. However, we lost the fishes one by one because they got overfed. The little boy learned the lesson already. Now there is a pet shop just a few blocks away from our place and he wants to buy some fish again. I just wish we can still maintain a small tank since i am still attending to our new baby.