I originally posted this in the coco section, but this appears to be a more appropriate section.So this is my first attempt. The plants are a month old and of the same strain and in a 85:15 coco/perlite mix in 1/2 gallon pots with built in run off trays. Lighting consists of a 650 watt LED with all red spectrums turned off, so maybe 400 watts running at the moment. Light is approximately 4' over the plants. Humidity hovers in the 45-65%. Temps during lights on are 75-80, and 70-75 with lights off. Plants are on an 18/6 light schedule. Plants are watered to about 10% run off approximately every 3 days and fed every other watering. On feeding day, plants get around 3ml of Soul Synthetics Grow per gallon (company recommends 5-10 ml) along with 5 ml of Cal-Mag. On watering only day, 5ml of Cal-Mag is added. Distilled water it ph'd to 5.8 +/- .2. I try to hit 5.8 everytime but when checking calibration of ph meter against reference solution, my meter is usually off .1-.2. My problem started to show up about a week ago, Image, Image(1), and Image(2) are of the same plant. Under normal lighting, new growth is lime green and seems really thin and underdeveloped, while older growth is darker green. Also found a dark spot as can be seen on on image (1). Image (3) plants seem the correct color, but leaves are twisting,curling and there seems to be minimal space between nodes. Image (4) is what i think is my healthiest plant for comparison. Image (5) is a few plants who seem to be in the middle of the pack. Do i have something to be concerned about or am i just an overly worried noob? Any and all advice is greatly appreciated.