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what's the powdery stuff on the leaf in your first post?

In some of your pics the leaves are really green, like the first pic of the batch of pics you posted you can see the leaves are a really dark lush green.... so I would say Calcium toxicity which is probably locking other nutrients, so it's probably the calmag that's doing it

Not sure, will go 12 weeks at least, it’s more the curling leaf tips I’m concerned about, I’ve upped the magnesium dosage to see if that helps

Yeah you need to measure the very top of the canopy, need to increase the distance between your plant and the light or find some other way of bringing the temp down

weird, could be genetic?

Looks like your temp is too high for a start, what's it reading?

Hello, not sure if this leaf tip curl is over feeding as bottom leaves on plant are yellowing, what do you think? Mr Nice SSH on day 70 of flower, feeding half strength AN Sensi Bloom. On alternative waterings adding about 1ml/5L of Canna Mono magnesium which is a tiny amount, maybe I should add...

grow medium is?

hey you know what...i had an osc fan pointed at my plant, i have gotten bud rot a couple of times so afraid of a repeat, as it happens i think i had the fan maybe too close and i did notice some wind burn, so maybe that didnt help either :(

the Delta 9 seeds were a strain that had never been grown before, so there's that - the second batch is a bit of an unknown quantity, i did grow a different strain from the same batch and it turned out amazing but this one had nanners....

one batch was Delta 9 Labs, the others were off a messageboard

hi, currently researching a raspberry pi sensor project, one of the sensors will be a Light sensor, to make sure zero light during dark hours.

fairly certain it's not a light leak the way my setup is, the tent itself is in a dark room - different strains, first was a brand new strain from Delta 9, second was a batch of seeds I got from a person on another forum, i did grow a different strain from this batch and it was perfect but these...

How do you know it was low in Calcium? Be careful with calmag, can easily fuck up your plant - if low on mag then give mag only, how is your pH? maybe mag is getting locked out

Hi, in my last 2 grows both ended up with seeds, basically the plants hermied or developed nanners - first time i suspect it was the timer, was a cheap analogue style one where you push in the buttons for whatever hours - i noticed the light was on after hours when it should have been long off...

Oh yeah you definitely need to check pH. You seem to be growing organically so im not sure if your medium setup supposed to automatically buffer But your water for example should have the correct ph, im in soil and keep my water at 6.5 to 7

Thanks

original pics looks like pH issue

cool, so no voltage/current/power ratings to be aware of? thanks