It's good you are seeing nitrates.
I'm trying to picture what you mean about doing a water change every 30 minutes or so... are you taking out a bit of water and then adding clean water back in and repeating this every 30 minutes? If you, you aren't getting out enough dirty water because your 'dirty' water is now mixed with the clean you are throwing out.
Can you use a big - clean - trash can or large plastic tub and mix all your clean water in it? Drain off that same amount from your tank and then add all the clean in at once? I know you are in a dorm room and it might get tricky but it is the most efficient way of getting out the dirty water...
Oh, yes, use the biosafe on all your tap water. I don't know that I'd bother with the biocoat right now.
Cathy
Cathy you are confusing me a little, I think we may have a little mis communication
My question was is it ok for me to do a 50% change, add bio-safe, then wait 30 minutes, do another 50% change, add another dose of bio-safe, and so-on until the ammonia is down? I do make sure that the water temp is the same before I start adding it.