How Come Some Fish Are Not Affected By White Spot?

[VidVid]

hi.
i had a tank with an outbreak of white spot. somehow, the white spots are always visible on the tetras and no visible signs on my any of my kribs. My kribs are really coloured up and very active. Can fish who are extremely healthy not be affected by white spot?

 

[Colin_T]

if fish are not stressed then they are less likely to be affected by whitespot. It is stress related and can affect 1 fish or all the fish in the tank. Your kribs are probably stressing out the tetras causing them to get it. Just treat the tank properly and it will go away and never come back, (unless you re-introduce it with some new fish)