If I was convinced one fish had ich I would take them all out. The clowns should be easy to catch when they are sleeping, at least they have been for me.
I think catching the clowns would be easy too, they practically swam into the net with curiosity when I was going after the angel last night.
The little blenny may be difficult (wickedly fast), although he is super curious and a pig at feeding time, I might be able to get him during feeding.
The trouble is, in no way am I sure that it is ich. Some of the signs are there, but the spot doesn't really look like ich from photo's I've been looking at.
The spot is still there, I'd swear it's smaller (but that could be a trick of the light in the QT), and I have not seen her try and flick her flanks at anything in the QT tank in the couple of 15 minute observations I made late last night.
I will study her, (him?? How do I know), tonight and see if there are any changes.
How can I be sure that what the angel has is actually ich?
If it is ich, and it has got into my display system, what s the likely hood of the remaining fish in there showing signs of it so that I know for certain?
I want to be as sure as I can that what angel has is ich before I take the other fish out.
If it isn't, and it has something else, then by taking the rest of the fish into QTY with her I'm pretty much guaranteeing that whatever she has I'll give to the others whereas at the moment there's a chance she hasn't passed anything onto them or into the display.
Could I still have ich in there from the angel but never actually see any signs of it appear on the remaining fish, then one day add a new fish and wham - white spot?
Cheers.