Nute Burn or Deficiency?

Does this look like nute burn? My first dwc run and had been having some PH issues so thought it may be due to a past lockout also.

PPMs are about 550 and I've been 1/3 strength fox farms grow big hydro and big bloom as scheduled by them. PH is a stable 5.6~5.8 now but some of the mid level growth has a slight showing of the tips darkening.



Any help would be greatly appreciated!

any takers?

rust disease. high ppm dont burn. lack of food burns usualy from low ph. you can run lower pH here to. try 5.5

Over misting when it was younger possibly? Whats would the best approach be to remedy this now?

Thanks!!

looks like Mag def

try giving epsom salts 1 tsp/gallon

Yeah I was leaning towards mag def too since the PH was steady rising on me for a bit with the foxfarm nutes. Seems like it took about 4 days to stabilize w/ the RO water.

Should I remove the leaves that look like that so the plant doesn't focus on trying to repair or would that be too much stress at only 2 weeks old?

removing them would be counter productive. never touch any leaves

Here are two more pics...


Less severe the higher up you go


Tips curling down and lower leaves drooping...

Should I snag some Cal-Mag? I know I read a couple people said they experienced some deficiency issues using fox farm nutes.

Thanks!

I would just use epsom salts. The Magnesium deficiency could be caused by having an excess of Calcium. it's better safe than sorry.

Cool will do, thanks!!

Ok couple more things....
I added a Tablespoon of epsom salt to my res which has about 12-13 gallons in it currently. My PPMs were at 550 and shot up to 720+ from just a tablespoon which seems high for 2 week old plants.

So while looking at recommended PPMs/age charts I saw that Fox Farm recommends a PPM of 1120-1260 at 2 weeks old on their hydro schedule?!
Maybe I just diluted the nutes too much in my RO water and that caused the deficiency perhaps?
Everything I've read said to hang around 200-400 PPMs week 1 then gradually increase to about 1200-1400+(depending on plant response) by peak flower.

Hitting almost 800 in week 2 may burn/lockout my plants then right?

Should I just leave it then since I'm way below their recommendation or dilute it some or just flush out the whole res and start at square one?

Thanks!!!