Everything wrong

Hello,

in two days my plants have gone from good to really bad ... i hope somebody here with more experience can help me out with good advice.

first my growroom description:
- dwc, single tank, 100l,
- 6 plants,
- two water pumps to mix the watter, one big airpump with two big airstones to pump oxygen in.
- 400w hps light

currently i am two weeks into flowering. (since i switched the lights). i changed nutrient solution 3 days after switching the lights.

i use two-stage (active carbon + reverse osmosis) filter to purify my water, then mix in hesi nutrient solution.

my ph is 5.8 at the moment. i usualy put it on 6.1 then leave it drop (in flowering ph is constantly dropping for me for some reason, while in vegetation stage its climbing) till 5.7 before i put it back up.

when changing nutrient solution for flowering i put my ec on 1.5 ... its been climbing since then (till 1.8 yesterday) but this morning i added pure water to let it back down to 1.55

so two days ago i noticed that some bottom leaves are turning a little bit yelowish and that the "shiny green spots" apeared on some of the bottom leaves. i decided i should bring my ec down (but i waited a day for no good reason). the next day bottom leaves were dead (nitrogen deficency ? two weeks into flowering?) the "shiny green spots" were on lot of bottom leaves and also started to apear on middle leaves. also i noticed brown spots (circular) as well as brownish centers of bottom leaves. also on some leaves i got brownish corners and brown spots on corners. the new growth leaves seem thinner than usual and curly somehow. some of the leaves that died off look completly fine (normal color, no spots), yet they fell of a plant. this is not happening just for lower leaves but also the middle ones. i put ec down on 1.55 however i am wondering if there is something else i should do ?

my (uneducated) guess would be that my ec went to high, nutrient lockout happened, and now i am getting the effects of all the different nutrient deficencies ? if thats the case should i bring ec down even lower ? (1.0 ?)

here are the pictures:

this shows on some leaves, but not very common:


brown edges more common on bottom leaves: (besides the obvious loose of color)


brown spots on lower leaves (all over):


the "shiny green spots" and the browning of the center of leaves:
the "shiny green spots" go thru the leafs (they are also visible and look similar on bottom side of leaf)


new growth:


i am confused by seeing so many different things. its like each leaf has its own disease

thanks to everyone for helping.

I wanna say, mag/cal issue.

i would have to agree with the cal/mag looks like lockout to me and with ec climbing would also indicate that nutes are just building up in the water and not being used. what you can try if you dont have ready access to cal/mag is mix in some tap water with 1 tablespoon of epsom salt per gallon and see if things turn around

You may be locked up, calibrate your meter and check for bugs. Maintain lower temps. Phosphorous deficiency has that spotting. You may consider foliar feeding

my water temperature is from 17-19 celcius, air temperature is 20 during night, 25-28 during day period. i have co2 tabs which should contain calcium, which i add once per week. will try to find some epsom salt. its i dont have much nutrients. till now i always used hesi mix as they prescribe and it worked out good.

the epsom salt isnt a full out nute, it contains magnesium and sulfer and the co2 tabs you use might not have usable calcium in it, not all calcium is the same some is to course to be used and wont break down enough where other calcium is fine and easily used. the co2 tabs most likely have the course calcium to use as a binding agent for whatever ingredient produces the co2. also do you use the tabs directly in your dwc or in a separate container? if you use them directly in your dwc STOP your suffocating your roots with that roots dont like co2 only the leaves do.

solata10 said:

my water temperature is from 17-19 celcius, air temperature is 20 during night, 25-28 during day period. i have co2 tabs which should contain calcium, which i add once per week. will try to find some epsom salt. its i dont have much nutrients. till now i always used hesi mix as they prescribe and it worked out good.

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I am not a dwc user but most problems are ph, nutrient, or bugs. Time is a factor....treat it all. It sounds hasty but you don't have a diagnosis.