you can't read for shit. i'm sorry for the bluntness but i thought you didn't help "4 plant wannbeeees".. fucking pathetic imo.
back onto topic, hydro peroxide will work for little bits, but if it's spreading clip the infected areas off..and just keep checking for more eventually if you control you're humidity you should be able to get rid of it although it'll impact your harvest either way.
as for the flushed plants need more details on that one, could of been a few things..
but to save your troubles with mould and mites as scrog said, chop clean and restart sounds like your answer.