Okay, here's one. I've got some White Rhino and some Mint both growing in soil. They are currently in the veg stage, 18 hours a day, under a 1k metal halide. Temp stays steady from about 74f lights off to about 78f when the lights are on. Humidity is about 30-40% with plenty of fresh air.
They start out looking good and growing like I would expect, but recently, the newer growth is all starting to turn lime green, the leaves are curling under, but not curling and cupping/canoeing like a typical nute burn. All of the new growth is remaining very small and the stems a somewhat purple, while the stalks are even more pronounced in their "purpleness" and are quiet woody. I've been feeding them with a good veg fert at about 800 ppm, but I have a feeling my problem, once again, is the Ph of the soil. Last time I checked the runoff it was only about 6.0-6.2 maybe a bit lower. I don't want to try and just throw more nutes at the problem, and when I first prepared the potting soil I added the recommened amount of dolomite lime to help bring up the soil Ph, but it doesn't really appear to be doing the job.
I also don't want to start throwing epsom salts at it if it's an Mg lockout problem casued by the low Ph. If you think it's the soil Ph that's causing this problem, do you have a suggestion on how to get the Ph up? If you think it's something else, I'm interested on your input about that as well.
I don't have any currect pics, but could get some loaded up in short order if my description as to my problem isn't clear enough.
** A couple of more things, the leaves are really ridgy, kind of like a Ruffles potato chip, but obviously not as pronounced. They're not flat and smooth as they started out originally. They also appear to have lost they're luster and look somewhat dull/dry, but not crispy. They just aren't nice and green and supple as a healthy plant would be.
Thanks in advance for your help.