Can ich spread in a matter of minutes?

[FishBoy101]

Angelfish might of had ich(saw 2 tiny dots on the back fins), put in the angel, but then noticed the dots. I immediately took out the angel and put them in my quarantine tank. Recently had a cycle crash and didn't want to put the angel in there, but after seeing the dots I put them in there. Do you think(if the angelfish had ich) it would have gotten into the main tank? Should I start ich treatment? Thanks.

 

[jkkgron2]

It’s possible, but unlikely. I wouldn’t treat the main tank unless you actually see any signs of Ich.