Does this look like root rot? If so, what do I do? I read peroxide would help - all I have is the 3% stuff from the drugstore right now. No idea how much to use anyway.

Info. DWC with 3 bubblers (in case one fails) so lots of oxygen. 10 gal res. Water temp 64.6. Ph 5.6. ppm 750 (tried lower and higher, still tweaking). 3 weeks of flowering down (started week 4 yesterday). T5 flourescent lighting (2 cool, 2 warm). Using Canna Aqua Flores nutes.

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i'm using canna aqua and no that's not root rot. actually, your roots look really good. it's just that the part A formula has this reddish brown hue to it. the leaf problem though, i don't know. i'd like to know what the leaf problem is, in case i run into it. are you only using canna aqua flores?

Right now, that is all I am using. I tried a little EPSOM salt since I thought I had a mag deficiency, but I have since replaced the entire res and am just using canna aqua flores.

well, i know that the flores is a bit low on the N or if it even has any at all...

that could possibly be it, which isn't really a bad thing. see if a shot of something with nitrogen will help, just a little though.

This morning when I checked them at the usual time, the pH was way up (6.9) and the ppm was 800. Can too much nute cause pH to fluctuate more?

Before the res change the pH would go up from about 5.4 to 6.0-6.2 each day which was very manageable.

I added a little bit of Nute with N (as you recommended), but decreased the overall ppm to 600 and got the pH down to 5.2. Before my res change I kept my ppm around 500-600, and my pH was much more stable.

I have attached pics from today. Sure looks like too many nutes to me and maybe a deficiency of something, but I have no clue of what - seems like Mag or N, but I have studied gobs of pics and just cant tell.

I will have to leave my girls alone for the next 2 mornings since I have company coming over and wont be able to get at them. Hopefully, they will make it through.

Interestingly, as you may be able see in the pics, one plant - the smallest one (WW) - has NO issues at all. The other 2 larger ones (different strain, but I don't no strains of them) have the issues. Plant1 is WW and 2 and 3 are unknown. In the last pic it shows plant1 (best one) in the background with plant3's bad leaf.

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i know canna aqua is a bit modest on the magnesium. you may want to replace the epsom in your res..as the last pic does look like mg deficiency. i got some calmag cuz i thought i'd run into this since i'm using the canna aqua and also RO water.
i'm definitely not an expert though.

Thanks. I will do that today. I got my guests out of the house for an hour so I can get at my girls.

I am actually now starting to get real nervous. My plants are getting worse each day. More leaves have issues. The leaves with issues are getting worse. There are still lots of bud sites and they smell great, but I am afraid they are not going to make it. On Monday, 4 weeks of flowering will be done which by my calculations gives me 4 more weeks after that. If I could just keep em going another month.

I have gone so far and tried so many different things and nothing seems to work. I attached todays pictures and now plant1 is starting to yellow and curl like the others.

My pH continues to fluctuate. From yesterday to today it went from 5.2 to 6.45. It seems like this fluctuation is the root pf my problem, but I cant get it stable. My water temp is 64.2 and I dropped the pH to 5.16 today.

I know I am not doing the right thing or the problem would not be getting worse, but I have studied, researched, and tried tons of things and I seem to be fighting a losing battle.

More pics show the continued degradation.

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just from what i've seen, with all the canna grows...the leaves always seem to yellow a bit during flower. it's been like that in almost all of the canna nute grows i've ever seen online and the buds kept pushing through until an awesome harvest each time. almost like the nutes are pretty gentle on purpose so as not to fill your bud full of hydro fert chemicals..

i was comparing with this one book i have, marijuana horticulture, and it looks similar to what they have listed as a sulfur deficiency. actually, it looks a bit deficient in all the macros and secondary nutrients...jeez, i have no idea really. sorry. maybe they're just hungry? what's you ppms now? try this chart
CANNA PK13/14

and try International Cannagraphic
there's some good info around there

PPM was up to 700-800 which is in line with their chart, but they seemed to be getting worse and pH was harder to manage so I dropped it back down to about 500 ppm. Hell, I have worked my butt off on this and still seem to be clueless on what to do.

The reason for mg lock is due to high calcium content of the tap water.

It is too late for this grow to be saved by RO,
although switching now will help the yield increase some.

As long as you continue to use tapwater,
you will have this problem.

It gets worse during flower,
due to the high demand for mg.

.