Omfg Halp shit is spreading fast

Okay. like 1week ago I noticed some small brown formation spots on my leaves went to the grow faq and went threw it. figured out it was some fungus and bought a all purpose fungicide started using it and now a week later

the 2nd level of new leaves the very edges of every blade has little holes in them surronded by yellow/brown and making them shrivel up and curl and its spread from 1-2 plants a week ago to half of my plants now.

I will have pics tomorrow

I also recently started mixing 3ish drops of hydrogen peroxide per half galon of water could this be that burning them? (the orginal brown spots were there before I started using hydrogen peroxide)

Hmm... Need some pics to see... I don't think I've heard of anything like this.
Get some pics so some more experienced growers than myself can diagnose this.
Sad to hear.

Peace