looks like minor nute burn... ALTHOUGH! Looking at the color of your plant... it looks EXTREMELY light in color... so maybe it isnt burn. Maybe pH imbalance causing lockout? Tough to say
If it is nute burn though:
If your running organics i wouldn't even bother flushing for such minor nute burn. Just watering with plain water for the next few waterings is enough.
Feeding organics, is really feeding the soil and the microorganisms within it. Organic nutes arent chelated the way inorganics are, so the nutrients aren't as readily available to the plant, therefore less likely to cause burn in the first place, but even if you do acquire some minor burn (such as yours) it isnt reason to panic the way it would be with inorganics, as its not likely to progress beyond what you already see, so long as you drastically reduce the amount of nutrients being added into the medium.
I made the mistake though, of getting slight nute burn like yours.. next time i watered only used plain water. The following water, i did 50% strength nutes... burned them even worse. You HAVE to give the organics time to break down in the soil and become available to the plant, or they simply build up until they burn (much in the way salts build up over time with inorganics)
