You should be set. Once you have the refractometer, you can start lowering the SPG , over the course of 2-3 days until you get to .009 spg. I treated my fish at this level for 4 weeks with good results. You can then observe them for 2 weeks to make sure they are clean. Watch the PH
closely, the changes in the SPG may do funky things to the PH
, so you may have to buffer.
after the tretment is finished, remember to bring up the SPG very slowly, like .001 per day. Bringing up to fast can hurt your fish.
Call your LFS
first, I couldn't find a refractometer around here, I had to order it online.
Here is the one I ordered, it works great