experienced hydro growes pls help!!!!!

parameters:
One indica under 90w ufo led light about 5 inches from top of plant
3 gallon dwc bucket
humbolt 3 part nute system(grow, micro, bloom, hydro honey,white widow root enauclator)
room temp and humidity 75-79 degrees/58-65%
resevoir temp 78-79 degrees
use tap water at 248ppm
resevoir 938ppm right now p.h. 5.8-7.0( usually stays around 6 but has risen on me a couple of times after water change) 6.0 right now
9in fan set on low for air circulation
plant was planted from seed on May 5th
What ive done so far with no luck:
About two weeks ago My plant started to look wilty with the leaves curled down and the tips of the bottoms where turning brown. this came right after I had changed my water and upped my nute strength....I thought I had burned my plant so I flushed it with ph adjusted water for 48 hrs.....I now think that was the wrong move because since then my plant has sown signs of several nute defiencieys as u can see. After the flush I started out with a nute solution of 570ppm....plant continued to get worse so I raised the strength to 670ppm waited about 4 days and plant still looks deprived so 2 days ago I upped it again and am now sitting at 938ppm with no signs of improvement. I know im not burning my plant cause as u can see from the pics my top growth is whats being affected first. the bottom leaves im showing you is from about a week ago or so right after I did the flush. anybody have any ideas on whats wrong and what I can do to fix the problem. I will be ready to flower in a couple weeks and need to get my baby back to good health. Thanks in advance for all the great advice from experienced growers.

looks like a combo of nute burn and ph lockout. dwc plants do not need a high ppm of nutes, the roots are sitting in it. i never go above 600 in dwc. when plants are vegging and first couple weeks of flower the ph should be around 5.5-5.7. this allows the plant to be able to get the nutes it needs for growing. at later stages of flower, 5.9-6.2 works good. consistant ph will help.

Kenny,

Let me first caveat what I'm about to say by stating that I don't claim to be an expert in any respect, but I do grow exclusively in DWC and have had 4 successful harvests.

One thing that jumps out at me about your set up is that you are using tap water. I use Fox Farm Nutes and have had similar issues when I used straight tap water. I had slightly better results when I would pass the water through a water filter of some sort (pur, Britta, etc.) and then leave the water in an open container to sit for a few days to allow the Chlorine to dissipate. The best option for home filtration would be an reverse osmosis filter. Costs about $60 at HomeDepot and isn't that hard to install under your kitchen/utility sink. After doing all of that then I would mix the nutes and adjust the ph just as you have been.

I've had better results still with using distilled water from Walmart. The one with the pinkish cap. Costs about 70cents per gallon. This is the best way to make sure that there is nothing in the water preventing the nute uptake in the plant.

I completely agree with what superstoner1 says about watching that ph carefully. 5.5-6.0 is what a rep from FoxFarm told me to hold everything at as well. The other thing they suggested is approaching the addition of nutes with caution. In many cases being willing to air on the side of less nutes rather than adding too much. DWC is like walking a tightrope. All elements must be in sync otherwise it's too easy to have a catastrophic accident. I've killed about 3 plants just because 1 minor thing was off. However, once you get the hang of it you feel like a magician.

Not a hydro guy but resevoir is supposed to be about 68 degrees?

too much nitrogen (thats why your leaves are dark blue instead of green)

needs more potassium

needs more phosphorous

needs more zinc (thats why the brown tips)

needs more of most likely all of the micro nutrients.

give them some flowering nutes and some micro nutrient booster (definately needs iron and zinc)

tap water is not as bad as everybody says. if you can drink it and it doesnt killl your lawn it's ok. dont worry so much about chlorine, your plants require cholrine for growth. its a nutrient.

i had to look up the analysis on those humboldt nutrients, they have ZERO zinc! thats bullshit!!! Check it yourself and youll see, NO ZINC! and are short on iron phosphorus and potassium.

white widow "root inoculation" and "honey" sugar stuff is counter productive in a dwc. stop using them. they will only grow funk in your reservoir. i dont even add that shit to my soil in my garden.

i dont think that stuff will work unless your water has fucktons of zinc and iron dissolved in it from the tap.