New Grower Few bigger brown spots

[HYSDOA]

I was away for a day and I get home these brown spots are on a few of my GSC leaves. Any ideas? Thanks
6weeks old
medium: soil/perlite
(2)300w LED + (1)150
hanging 14" above canopy
20/4 schedule
47%RH 74F
nutes:
2-3mg Cal-mag every watering
1-34-32 Flower fuel every other watering
6.5 PH

 

[namvet25]

I would raise your lights up to 18 or 20 inches and lower on time to 18 hrs,this is plenty time during flowering.That is some strong bloom nutes so don't over feed this is worse than under feeding

 

[HYSDOA]

Okay I though Veg was suppose to be 20" or so and flowering drop down to 12"- 16", I will adjust them up a little bit. I have been giving the plants about 1/4 dose of the Nutes, I keep telling myself less=more

My run off PH was 7.3 last night, if I feed with 5.8PH will this lower it or do I need to do a really low 5.0PH flush? I have never flushed the pots before, it kinda scares me I feel like im going to end up over watering if I run 5-10 gal of water through them

 

[Waira]

What soil brand? Your input pH is no reflection of what the in-pot pH is, too many influencing factors... run-off testing is bad news too, crude at best, a disaster at worst depending on what you do next....
Is you pH meter in good working order, calibrated, stored in the right solution, never dried out? They are easily knocked off spec's....
What did you put in when you tested this run-off, water only I hope? Is it tap, and what's it's pH and EC/TDS? ... that it's coming out alkaline is very suspect,....
Get a decent soil ph probe, like the Accurate 8 (CPW)... so much hinges on pH, not knowing it is a real gamble...

All symptoms up high, on tops? might be a micronute lockout, if that pH is even sorta close,... above 6.8, Fe, Zn, B and others start to get locked out...

 

[HYSDOA]

Using Espoma Organic soil with perlite and worm castings mixed in. I ordered a vivosun PH meter and PPM meter. I calibrated it about 2 weeks ago, I usually double check the ph with the small bottle of liquid tester when I PH it to 6.5 and it changes the water yellow(6.5PH)
I use tap water that comes out 8.4, I always PH it to 6.5 PPM says 440.

Most of the brown spots are up higher but some lower fan leaves started to turn colors, I cut them off the other day and no other foliage has turned colors.

 

[Waira]

whoa, that's some rocky water at 400+ppm! ... it's part of the problem, cumulatively it builds up in the soil, and can start to drive the pH up out of range... All that CaCO3 screws with uptake of other nutes too... Adding Ca-Mg makes matters worse, though that tends to be more available for uptake than CaCO3 (Ca in that is largely unavailable), the problem is those cations too are still getting locked out...
I recommend a different water source, low ppm...
what dosage of the bloom nutes is going in? ..ppm? No other nutes? I'm betting that stuff is a PK booster, and not a complete nutritional profile, lacking some secondary and micronutes... soil alone won't cut it for those...
.. lowers look like P defc., uppers maybe B defc... both have antagonistic uptake issues with too much Ca++ present...

I'd flush that pot with RO/Di water, about 2x/pot volume to try and blow out some of the build-up in there,... on the last pour, use a base bloom nutes at 1/4 strength to restore and balance nutes after that stripping.... check pH and ppm of run-off to see how things are correcting during the flush...

 

[HYSDOA]

Im on a well so is that why the ppm is so high? Im using 5 gal fabric pots but they probably have 4 gal of soil in them. If Im going to do a flush should I run 8 gallons of water through the pot quickly within few minutes of over a few hours through the day? Should I use 6.5PH or something low like 5.0PH? Any suggestions of a good set of Nutes? Ive heard good things about BioBizz and was thinking about going with there line up.

For finding a new water source... buying that much distilled water from the store would get expensive. Is there any way to filter it better?

 

[hope2grow]

Im on a well so is that why the ppm is so high? Im using 5 gal fabric pots but they probably have 4 gal of soil in them. If Im going to do a flush should I run 8 gallons of water through the pot quickly within few minutes of over a few hours through the day? Should I use 6.5PH or something low like 5.0PH? Any suggestions of a good set of Nutes? Ive heard good things about BioBizz and was thinking about going with there line up.

For finding a new water source... buying that much distilled water from the store would get expensive. Is there any way to filter it better?

Re good nutes.. get yourself some AN sensi bloom.. and grow as well if you like.. I only use bloom as we're dealing with autos.. it's pH perfect.. it looks after all the crap I don't want to. I've been growing for 6 years without any major pH problems.. in soil. Ive never owned a ph meter or any of that stuff.. I've never measured ph.. not even sure I would know how.. and I personally put that down to AN pH perfect range.. surely I haven't just been lucky for 6 years over probably hundreds of plants?? Sure I've had a few issues.. cal/mag mainly.. which ppl seem to accept is down to LED lights. If I had to start measuring pH/ec/ppm honestly.. I'd give up growing.. it's just not for me. Can only speak for myself of course.. try AN Sensi bloom.. and hopefully then you can put the science kit away

 

[Waira]

Im on a well so is that why the ppm is so high? Im using 5 gal fabric pots but they probably have 4 gal of soil in them. If Im going to do a flush should I run 8 gallons of water through the pot quickly within few minutes of over a few hours through the day? Should I use 6.5PH or something low like 5.0PH? Any suggestions of a good set of Nutes? Ive heard good things about BioBizz and was thinking about going with there line up.

For finding a new water source... buying that much distilled water from the store would get expensive. Is there any way to filter it better?

Yup,... and more hard water even as a flush isn't going to help this much, it's not removing much of the built up CaCO3 in there and at 400+ppm, it's still too high as pure CaCO3 hardness... Lowering the pH doesn't remove it, it just adds even more ppm's from the heavy use of acid agents for driving the pH down...
Bottom line is there's no work around for really hard water, you need to switch or at least dilute it down to about 150ppm....
Look for those self fill machines at grocery stores, or a water store; those will have better deals on water and it's very soft(low ppm)....