MeTree there would be no expense out of your own pocket unless you like to add little goodies. All of my tank designs are simple and easy to maintain. Im just going to push your creative juices as you design yours. You'll find things don't have to be expensive or take forever to set up. As far as fruit flies go....I don't understand why everyone is so afraid if them. They are by far the easiest feeder out there and they're practically free because they make themselves. I even reuse all my old cups. The only thing i ask of you... is your mom is going to ocassionaly have to take you to pick some things up at a petstore or maybe Home Depot, but most of the stuff will be sent to you.