1) Normally i will restart my QT tank after each successful or failed round. For filter sponge will throw away and replace with a new seeded one. For media, I will bleach it to ensure is clean and remove the medication within the media. 2) Drip acclimated slower if the temp different is big. U should try to aim for below 28c for ur QT tank using a fan. Sensitive fish don't really do well if the temp is too high. 3) After completed all treatment for the fish, do a water change and put carbon in to remove the medication in the tank. Observe the fish for 3 days to a week to ensure all good before proceed to move it. 4) Depend on the treatment you using, below for ur reference. Some treatment can be done concurrently but I will suggest to do it individually unless u know what can be mixed together. - Ich (14 to 30 days chelated copper treatment at therapeutic level) - Fluke & Internal worm (2 rounds of Prazi treament) --- 1st round treatment 5 days --- Take a break for 5 days --- 2nd round treatment 5 days - Brooknelly, Urenoma (14 days Seachem Metroplex) --- If still not ok, do one more round - External bacterial infection (10 days Seachem Kanaplex) 5) I prefer to set my salinity at 1.020 when I QT my fish. Less stress for them. Once treatment completed, I will bring up the salinity slowly over a week while observe the fish health. Hope this help.