stop, don't flush.....if this happened after your last watering then is defenetly overwatered. usually is when plant gets real droopy but still green either under or over watering....nute burnt would have burnt up your leaf tips and curled leaves and such. looks like overwatered to me id say let a fan blow close to the dirt to dry them out. i hope this helps a lil more info would be great....nutes/how often u water/ and such