Flush during early flower?

Flushing may cause starvation. Try to reduce the nutrient in half for the next two waterings.

Great for water application, won't work for long with salt ions running through it crystallize causing algae, and clog the narrow lines and ceramic cones. In a fully organic grow that only needs to add water with a little enzymes perfect. Generally speaking when you deliver nutrients syntheticly they are applied with each watering very much on demand. You would need to create a medium with very high CEC (salt storage) and have the plant cycle the cec itself using hydrogen and proton pumps. Your plant looks like its starting to lose its magnesium, slight chlorosis creeping in. Gluk.

No, just reduce the strength of your fertilizer mix.

or a sulfur deficiency... yellow tips can be caused by both over and under feeding. leaf symptoms are not discrete. Given color of plant, i'd wager it might need more. soilless irrigation procedure, amend if deviating 1) always fertigate and always get 10% runoff or more out the bottom. Do not let it sit in its piss. 2) wait for apprpriate dryback and repeat. The runoff is essential to long-term health and taking full advantage of the type of nutrients you should be using in a soilless context -- 100% soluble and 100% plant-available. The runoff maintains nutrient concentration at a consistent, predictable level and avoids buildup over time. Any problems seen are 100% the result of the formula and a formula change will 100% correct the problem. Eliminates a lot of unknowns. If not doing this, i'd correct that first before anythign drastic is done to the formula. Knowing ppms of the nutrient elements or their weighted-average percent of mass from labels and dosage helps greatly over time.. You'll easily recognize where your upper and lower limits are and easily avoid most symptoms .. a few blemishes that don't progress much is not a major concern and inevitable at times. e.g. if your S is significantly lower than 100ppm, i'd wager you have a S-deficiency. When religiously getting 10% runoff, you can be more condient about what you see and what needs to be done. In this case i'd correct any irrigation issues before adjusting formula. Fertilization is a culmination of everything you've done since day 1, so not adhering to proper irrigation may come with additional unknown effects over time.. different ratio and concentration of nutrients around roots than what is expected and a different adjustment needed that is not as correlated to what i just mentioned.