Dry Brown Curling Up Leaves. Please Help PICS

Hi there everyone.
Some help here would be greatly appreciated.
Im on my 5th grow and everything has been fine until now.
As you can see in the pics my leaves are going brown , turning up and going crispy ??
My setup is as follows


Hydro grow
plants are in veg
around 4 weeks old
water temp 64 f
day temp 73 f
night temp 62 f
1 x 400w hps 32" away from top of plants
ph around 5.8
humidity 38 day 68 night
pump in resevior has air inlet for oxygen
water and nutes changed once weekly
using aqua vega nutrients by canna


So far i have
Changed water in resevior
left for 48hrs in just water (Very bad ive since been told)
added half strengh nutes
but its still getting worse.
its not happening at the top or bottom of the plants it is all over and getting worse daily.

Can anyone help me Please .....??
Thanks.

I'm no expert but it looks like your "flush" cause a deficency of what I cant remember I'm bout to pass out. But you should not do that to your plants in hydro. Soil acts like a buffer in between feeding that holds nutes when your in hydro you do not have a buffer so you were starving your plants at a very important stage of growth right before flower. Go with 1/4 strength nutes so you don't shock them anymore. give it a couple of days to get better and I'm sure you can get some more advice here than what I have to offer. But why would you "flush' your plants????? Change the rez and replace with fresh nutes and water yes. Straight water Noooo. Good luck hope they get to feeling better and Welcome to RIU

How are you testing your PH ? (I'm not 100%from the pics but that looks like a PH fluctuation problem)

Sorry when i say flushed plants i mean changed water in resevoir.
PH is being tested with those drops out of a bottle.

steveoo said:

Sorry when i say flushed plants i mean changed water in resevoir.
PH is being tested with those drops out of a bottle.

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But why 2 days with just water?

I was told to do it.
Bad advice then

Yeah it was. But from your specs sounds like your on the right track. Just do more research before trying things you have "heard". With your nutes I assume you have your veg and micro nutes correct?

steveoo said:

PH is being tested with those drops out of a bottle.

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Doing ahydro grow, I would HIGHLY recommend you get a PH pen for more accuracy in reading your PH!
I just took another look at them pics, whats your humidity in your room ?

Thanks for the welcome newbie grow420
Ive just stumbled across this site and its great ...

Remember hydro plants have to have nutrients present during all of the growing process its not as forgiving as soil also do you have good airstones for your oxygen in the water?

The pump in the resevior has an air inlet to provide bubbles for oxygen.
Ive grown with exactly the same stuff a few times before with no probs at all its a puzzler??

The nutes im using ive use many times before so they should be ok
The humidity in the room is 38 day 68 night

steveoo said:

The pump in the resevior has an air inlet to provide bubbles for oxygen.
Ive grown with exactly the same stuff a few times before with no probs at all its a puzzler??

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Hmmm you even did the 2 days with just water? If thats the only thing you have done different then that would lead 1 to believe that the cause of this but like I said I'm not sure you might want to bump this up during the day to get some better advice because there is a lot more people on here then with probably better info. I have seen and read articles with similiar problems that you have but I can't remember to give you a link. So good luck. And I'm not saying the other guys advice about ph is wrong I don't know for sure. Good luck

Just a question about nutes, can they go bad at all ? maybe cold weather affects them whilst kept in a garage (below freezing)

Ok
Many Thanks for you info newbie
when you say bump it up do you mean the humidity?

newbie grow420 said:

Hmmm you even did the 2 days with just water? If thats the only thing you have done different then that would lead 1 to believe that the cause of this but like I said I'm not sure you might want to bump this up during the day to get some better advice because there is a lot more people on here then with probably better info. I have seen and read articles with similiar problems that you have but I can't remember to give you a link. So good luck. And I'm not saying the other guys advice about ph is wrong I don't know for sure. Good luck

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I agree, bump your thread up during the day for more advice, Like I said, Im not 100%...

steveoo said:

Just a question about nutes, can they go bad at all ? maybe cold weather affects them whilst kept in a garage (below freezing)

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This might be a problem, I think they are meant to be kept at room temp.. Again, Im unsure if this would be the cause of your problem...

I would try to get the humidity up to around 50% with lights on... but 38% isn't that bad!
Sorry I couldn't be of better help, Im not a hydro man myself though!

Many thanks Redeye, il buy some new nutes today
im in the uk and its 10.30 am here im presuming its night where you are.
How do i bump this thread up ?
PS what time is it there so i know what time of day to do it ?

steveoo said:

Many thanks Redeye, il buy some new nutes today
im in the uk and its 10.30 am here im presuming its night where you are.
How do i bump this thread up ?
PS what time is it there so i know what time of day to do it ?

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So sorry Steveoo...

I assumed you were in the states...

I would say this forum is most active between 9 and 12 at night for us..


Just add a post later on.. "Bump" and someone should help you out! Good luck fella!

Ok .
And again many thanks..

Il try tonight