Thanks everyone!
Ok... here's what's going on so far.
I'm placing an order for the refractormeter linked up above. At the same time, I'll get a few more testing kits.
The only test kits I have now are PO, PH and Nitrate.
For the last two days, my PO is 1.0, PH is 8 and Nitrate is 25.
I...