hydroponic nutrients

We are new growers.
We have a hydroponic system that is a drain to reservior system.
We are in the first week of bloom cycle 12/12. Most of the plants look fine. a couple of them look like they are starting to yellow (just Slighlty).
we keep the ph at 6.0 and right now the ppm is 1200. We check the ph and ppm everyday. the last couple of days the water level has been decreasing but the ppm has elevated just slightly to between 1200 and 1300 but the ph has risin to 7.0. What does this mean. are the nutrients supposed to go down with the water level? Is this the start of nutrient lockout? If so why?
we change the reservior every week and put a new stronger nutrient soloution in as advised by the gh chart.
Please help your suggestions would be greatly desired.
Thank you
I have added pic's
we use the flora series, along with hydroguard, sensizyme, dark energy, and super thrive.
we have 2 tables 4X8 with drip system drain to reservior. 2 1000 hps lights per table that are kept about 24 inches from the tops
we try to keep the humidty between 40% and 50% and the temp at about 77 degrees
our watering schedule is every 4 hours during light except one water 6 hours after the lights are off. we water for 15 minutes into grodons (spun rock wool).
I hope this helps you advise us.
Thank you again

marijuana team said:

We are new growers.
We have a hydroponic system that is a drain to reservior system.
We are in the first week of bloom cycle 12/12. Most of the plants look fine. a couple of them look like they are starting to yellow (just Slighlty).
we keep the ph at 6.0 and right now the ppm is 1200. We check the ph and ppm everyday. the last couple of days the water level has been decreasing but the ppm has elevated just slightly to between 1200 and 1300 but the ph has risin to 7.0. What does this mean. are the nutrients supposed to go down with the water level? Is this the start of nutrient lockout? If so why?
we change the reservior every week and put a new stronger nutrient soloution in as advised by the gh chart.
Please help your suggestions would be greatly desired.
Thank you

Click to expand...

First off good luck to you in your grow. I use a system that sounds a lot like yours. What week into flower are you and what nutes do you use? I like my ph around 5.6 5.8. With the decrease in water your ppms will raise leaving you with the need to add fresh water no more nutes. Your ph level will rise sometimes daily. Just keep an eye out. If you ever worry at your next res change flush for a day or so and re due res after flush.. As the plants get further in flower they will drink more leaving you with the need to add water.. I hope this helps, and hey, whats up with pics?? Yellowing, Id like to know what your feeding before thinking of a reply.. Check out the faqs at the top of page it helps a lot. Good luck!!

I have added pics and new info... Please help

Can anybody help?

Only thing I can think of at the moment is empty the res and put it on straight water for a week or so. See if it perks up any. Strongest guess at the present is it got over nuted. No gharuntees expressed or implied

Big Wheel

77 degrees is too high for the reservoir. But, those plants look pretty freakin good!

resevior is under shed protected from heat, basically outside.
I will test temp tomorrow.
thanks for the reply

Your nute's might be too strong. Most growers say to use half the nutes that the chart advises. You may be burnin those little beauties.
Keep Growin!

Thanks for all the feedback
We reduced the nut strength a little and they greened right up.
We are in the 3rd week of bloom
Looking good
Thanks again.