Hey Everyone,
I don't know if anyone on this thread still checks it, but I am also living in Philly, and I have been growing vegetables using a low-tech DIY aquaponic system in my small studio apartment for the past 2 years.
I post videos on my Youtube channel about it...check it out for some ideas:
http://www.youtube.com/user/PhillyAquaponics

Hope this helps,
-J