Heya, just to add onto what
@Terp1 said:
This fungus looks like bud-rot.
This BR (botrytis cinerea) will spread very fast if not disposed of as
@Terp1 suggested.
In future, 2 things to consider:
. Keep overnight (or coolest period) warmer than 68F to keep bud rot at bay.
. Keep humidity below 55%
I've had success in solving the above with a small portable heater on a thermostat.
Lastly, try to keep air flow as usual :)
Sorry to see this, you put in good work to get thus far!