nope-- you got a disease there hun-- from the lower leaves getting & staying wet...
We lost a bunch of seedlings and clones to it.. it just keeps spreading..
1st-- get the infected one as far from the others as ya can... Then
spray the plants with 3-in-1 fungicide and wait a couple days.. i the infected one looks the same.. spray her again..
if she is worse, and the others get it too.. spray them again and kill tyhe infected one.... loke I said-- it just keeps spreading and is very hard to get rid of!
Dampness in a warm room is a contributer-- so watch the temps and humidity real close!
No need for revenge, just sit back and wait.
Those who have hurt you will screw eventually themselves; and if you are lucky, God will let you watch!
Through What we create- we are immortal.