The first thing I do when I get a new fish is put it in two gallons of water mixed with 2 ml of formalin with a little heater and air stone. Leave it in there for about an hour. It helps to reduce stress if you ask your supplier or pet store where they keep there SG at. Have that formalin water and your quarantine tank water matched to that. Then just soak fish in bag for 15 mins to get temp up and put it right in the formalin dip. Then after an hour put it in your QT. I then proceed with tank transfer method and a couple rounds of prazipro on the second and fourth tank transfers. Then are a month of observation after TTM it goes in my display if it shows no signs of disease.