I pretty much set the whole idea out for you.
Unless one of us comes and does the project you need to input a bit too.
Go back and read my post.
It tells you about the control tank, about using only 1 variable in the rest (stating and showing you are only changing 1 variable and that you have a control will help increase your grade in the first instance).
You need to read the fishless cycle link in my siggie - or search on here for other threads that cover fishless cycling.
They explain to you exactly how to add the ammonia (fish waste substitute). To test for it - sometimes more than once a day - explained in the fishless cycle threads.
ColdCazzie has given you plenty more ideas to add into your research part, that are really relevant to the project.