Calcium deficiency?

I think so - I'm still new to growing and I haven't noticed a change to the amount of runoff so I assume she's still drinking. One of the other plants is also starting to show the signature brown spots (which I think is calcium deficiency). It's weird that, of the three plants, only one of them looks quite sick while the other two look ok.

Is the pot lighter after 24 hrs is what I mean.

Yes, definitely. I'll pay more attention to the weight but the pot is lighter and the medium is absorbing the feed.

Tref said:

Yes, definitely. I'll pay more attention to the weight but the pot is lighter and the medium is absorbing the feed.

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Cool. Your on the right path now. Too bad it’s a little late in the cycle but I’ll bet your next one will go much better. Just probably had a build up of food. pH of 5.8 is a good number to shoot for. Just keep an eye on your runoff ppm. If it starts to climb that means not enough runoff. Don’t worry about runoff pH. It’s what’s going in that counts.i

Tref said:

There's definitely calcium deficiency and potentially phosphorous too.

I've stopped using plain water and am now adding nutes each day. I'll post an update here in a week or so to determine if the problem has gone away.

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Only a Ca def no P def. Feed her everyday, 550 is low for 1/2 way through flower. I'd up to 800 and see how she reacts.

Tref said:

Apologies I forgot to add the nutrient schedule. It's a specific schedule for coco coir.

@myke is there a more suitable nutrient schedule I should be using? Any advice is greatly appreciated!

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Don't follow that chart that says to feed water feed. Feed every watering. That's also not a feed schedule from GH. That's some chart someone put together. The same chart is on several websites. You can search that image on google.

One of them is a well known site and they say:

How WE Use GH Flora Trio For Cannabis (Custom Schedule)
Here’s a chart demonstrating how we use the Flora Trio in drain-to-waste mediums like coco coir/perlite, vermiculite/perlite etc.:

Thanks for the advice everyone. I've started feeding daily and will move up to 800PPM for the remained of the grow. I was initially planning on growing Gorilla Glue next but after the advice from this thread I'm going to do a repeat grow (of GSC autos) and avoid making the same mistakes. I'll post some pics here in a few days to report back on whether the problem is fixed.

BLURPLE