IF it is ich then you can still be getting dots for a few days after starting treatment as the cure is on the freeswimming stage not the parasite. Ditto copper. However the earlier infection sounds more like brook or velvet, either of which can also manifest dots.
1.009 is good for ich, hypo, but formalin will cure the others. Dip rather than trat the QT as it will kill any filter bacteria.
Fun, eh