I mentioned ick to ask if brookynella stays in the water column/tank like ick does. If ick has no host for a time then it does not survive, supposedly I guess. So if there are no fish in the tank would brookynella go away like ick? Forget about ick, I'm just confusing things, sorry.
Clown still not looking good, will follow directions on the bottle like you said to treat the QT tank.