I've dealt with this many times too, and failed. I think partly because I relied on melafix to get rid of infection. IMO it's good as a qt for new fish or helping with healing injured fish.. maybe, but not much else. The medications listed on your other thread are good kanaplex (sp?) methylene blue bath can work to stop infection, but as said is risky. My only other thing to add is that if you change water daily in the qt tank you might reduce the effectiveness of the meds.. However if you treat in your tank you wipe out your cycle =( For future reference, (I got this great advice on this forum) keep a sponge filter in your main tank and if a fishy gets sick grab it out stick it in a tank and you have instant qt. How close is your 10g to cycled?
you could also pm HUKIT, ask him to look at thread, see if he can ID disease from pics and get his advice on treatment, he knows his stuff