Subject: I need further clarification on a science project involving daphnia's

I am thinking of doing a science fair project on which OTC medications effect 
Daphnia's heartbeat OR which polluntants effect daphnia's more. These require 
a microscope video camera because you have to replay the videa to watch how 
many times the daphnia's heart beats. Where can i get an inexpensive 
microscope with a video camera ? Also, do you have any ideas on how to make 
the project better. It is my last year doing a science fair project and i 
would like to make it really good. Please, please help :)

Re: I need further clarification on a science project involving daphnia's