help, browning leaf tips. over fert??

Hey all, im a new grower trying dwc. Im having a problem with the tips of my leaves turning brown on a couple 14 days old autoflowers.. they look a bit small to me but whatever. im using floranova grow and calmag right now. But i didnt start using calmag until 3 days ago, i stupidly, didn't realize i at least needed it around when using ro water. i think they were underfed and calcium / magnesium deficient a few days ago so i added calmag and some food, maybe i added too much food or not enough calmag or something? Maybe the browning on the lower leaves isnt a magnesium deficiency at all, but either way what im worried about now is that the brown tips are slowly creeping down the leaf.

My tds said i was at 1100 ppm at .5 and i brought it down to 800 or so if that means anything.edit: Sorry ill post pics get home, the top fan leaf.tips are browning/ yellowing from the tip in

I would suggest only 1/4 strength for auto . they don't seem to use or need as much .

Sounds like a cal/mag issue, especially with ro. The plant will be fine now that you have corrected the issue.

RO/DI water? then add cal/Mag
Nutrient solution temp is okay?
pH is okay?
You should be able to follow the feeding schedule.
IMO- I would go 1/2 strength on your nutrients.

You were cooking them, drop down to about 400ppm and ph to the mid to upper 5s. Keep res temps no higher than 65f or you'll have all kinds of problems.
JMO

hydrogreen65 said:

You were cooking them, drop down to about 400ppm and ph to the mid to upper 5s. Keep res temps no higher than 65f or you'll have all kinds of problems.
JMO

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your right, I overfed them im pretty sure. I just flushed system. sorry I forgot to mention, temp, ph was perfect, didn't buy a ppm pen till 2 days ago so pretty sure that's it. it was way high the first time I checked it but I don't think I diluted it enough. so today I just dumped all the water out and topped it off with fresh water and nutes. thanks all for the responses,heres pics right before I flushed, browning tips getting worse, just in case any of u think it might be something else.. by all means. i might not have added enough calmag the first time around but i should be ok now.