Reading Humble fish, it is definitely not Velvet. None of the fishes that died had the symptoms of velvet.
Sailfin continues to get better and all other fishes are fine. Hopefully the grime reaper has left the tank.
I do have a question about treating fishes with chemicals in the primary tank when it is not possible to catch the fish to put in a QT.
I had to turn the skimmer off when I dosed the medicine because the skimmer overflowed. With the skimmer off, there is no oxygen bubbles. How long can you leave the tank with no aeration ? In my case, I turned the skimmer off for 3 hrs to let the medicine "work", Then I spent the next few hours dealing with the skimmer overflowing. I had to top off about 10 gallons of water, making sure not to change the salinity,
I am now running the tank a 1.020 SG, subscribing to the theory that lower salinity will help kill parasites.
What SG do most of you keep a primary FO tank?