Help white fungus on dirt

Help i have white fungus on dirt on the plant i was flushing few days ago, i think its pretty close to harvest (lower popcorn buds are still pretty green) but top buds seem like almost ready for my liking. There are two more plants in the tent whom are 1 month away from harvest. Should i just clean the mold off or rather harvest now? I dont think that i have a problem with harvesting right now, expect im losing the popcorn buds but they are small as shit any way.

TLDR: white fungus on one plant (from flushing first time, almost ready to harvest) 2 more plants left that need 1 month to finish. Afraid if the fungus will spread should i rather harvest the plant number 1 now witch is almost practically ready.

 

I already kind of harvested the plant out of fearing what would happen to the other two that have a month or so left. No biggie, and yes it was due to water cuz i was flushing it few days ago. Guess the pot was kinda bad cuz it had only one hole in the very bottom on the center and it wasnt leaking the water out properly.