Thanks for the help guys, I think I will avoid a prime lens for now as I want something more versatile and it really needs to be < $100.
I found this on craigslist: Nikon/Nikkor 55-200mm lens f/3.5-5.6 for $60
http://providence.craigslist.org/pho/3443345857.html
Is this lens compatible with my camera and will I be able to take pics of my fish with this lens?
thanks!