Trying to diagnose

First post here. This is my second time growing in FFOF, and I've had mostly good luck. I'm a few weeks into veg and I have one plant that looks like this.

This is UNCUT FFOF fed with OR water. Until about a week ago we were not checking PH and adjusting prior to watering, we now are.

No nutes have been given to these plants. Just OF. They were transplanted into 3 gallon pots about two weeks ago.

Looking for advice on the sick one and also some kind of feeding regimen. I have some happy frog dry food but haven't used it yet.

Thanks!

I still wouldn't feed them just yet, with FF/OF you should get at least 5 - 6 weeks before feeding is really necessary. Other than that, when using FF, HF or OF soil mixes, its always a good idea to start your seedlings on a ca/mg supplement, as those soils don't have abundance of those two minerals in their mixes. And really I have found most soil mixes, even the good ones, lack the amounts of calcium and magnesium that cannabis plants need to stay happy out of the bag. Anyhow... you need to give them a ca/mg supplement, something like GO camg+, or GH calimagic together with some epsom salt, and that's whether you are just watering or feeding your plants to fix the current problem and to keep your plants fully supplied with the calcium and magnesium they will need to stay truly happy throughout their life cycle. I use GO camg+ at a rate of 3ml, plus 1/2 tsp of epsom salt per gallon of water, starting from day 7 until the end of week 7 of flower. and be sure to pH your water or feed to pH 6.4 to 6.6!

Are these organic sources of Cal mag? Do I need to PH if I'm running organic soil and RO? I heard it kills the microbes. Thanks for your response. I'll hold off on feeding.