Tracon, I have done this......
i have a fountain in my big girl's cage...it does however have downfalls...fora a filter, Zoomed makes small submersible filter which is what i used..If I can, I'll find out what it was called. It worked and looked awaesome, but the problem was that Hermione liked the moving water over her back, and she would lay on the fountain sometimes and the water would trickle over her back and out of the fountain, into the bedding soaking it. It was a pain-in-the-you-know-what to clean out her cage almost every day. she enjoys the fountain, but i have just stuck to plugging it in when i have company..ya' know, for looks. She has never pooped in it, but i would want to clean and sanitize it the minute she does!