It looks like shes responding to her first nutrient dosage. This seems to be pretty normal with the grobo. To reduce the stress, you can add an extra cup of RO water directly into your reservoir and do daily water top offs (fill only) until she stops showing new spots.
With your water temp that high, I would recommend looking into some microbes to protect your root zone (products such as hydroguard). She would be happier if the RH was a bit higher, other than that, she does look good.
Its okay you’ll cut off those leaves in a few weeks. Look at my early grow. I had ugly leaves at first too but she kicked ass later. The spots seems to be on the old leaf only and not the new growth. They are very resilient plants and bonce back quickly once the conditions are right
Have you calibrated your PH probe before starting your grow? it could also be ph issues. If your probes do need to be calibrated then I would recommend a drain and fill.
However if your probes are indeed calibrated, then this is just the normal browning everyone on AG gets at first, just add more water to the reservoir and do daily top off. To avoid this next time, allow her to get a bit bigger in germination under a dome and slowly lower the RH to 50 before entering veg. I would even allow her leaves to yellow a slight bit in germination before entering veg.
I also used this as a grow guidelines when I first got started, it really helped me get my conditions in order.
If you are interested in the accessories many growers get on AG to help their grow:
Extra air pump + Extra airstone (big one) - this will be bonus air for the roots and back up air in case grobo malfunctions.
Mini fan - will help your plant become stronger later and help dry out the coco pod to avoid dampening. You can start putting a fan on her in a few weeks.
Magnetic hooks - training and support
Hygrometer - monitor conditions
Hydroguard - root protection
Scrog - if you are planning on training
Warer chiller - baller status and expensive. If you have basic electronics experience, you can build a DIY chiller for like fractions of the cost with peleteir and water blocks like how gamers do for their PC
These items are not necessary to complete your grow, but it helps the success of your grow.
Thanks for the info man! Unfortunately I can’t calibrate the pH since I don’t have any calibration solutions but I did just fill/drain for the first time in veg and it only filled to the second level, is that normal? I’m wondering mainly because I used the same amount of Hydroguard (1.5 teaspoons) as before but this time the water is lower.
Congrats on your new grow! @Vicc is spot on, unless you are using tap or another type of unfiltered water, your unit has dispensed far more pH down than what is typically used at this stage of growth. Get that probe calibrated ASAP, your plant will recover.
This is her now, doesn’t seem to be doing much better, I’m still waiting on grobo support to get back to me with ph readings. I have my ph solution coming in tomorrow.
The roots a little brownish? Could that be because of bottle #5?
I had the same problem I put a support ticket in and I was told to do another drain/fill with the same water and make sure the nutrients were properly dispensed. Apparently there was a bug in the software that prevented the plant to be feed after drain/fill they,are working on the issue.
The calibration may have been too late. This was why @SWSVIC and myself was trying to express our urgency. At the moment, it would be more beneficial to start over to give your new seedling a better start. Taking this much abuse early on will probably be detriment to your end yield