Looks fine to me, what strain is it? I've had 3 different strains And they all looked different Sent from my LG-D801 using Grasscity Forum mobile app
What medium are you using? Possible nutrient toxicity and/or ph imbalance imo Need more info as well. Temps, rh, lighting, watering frequency
MG No thermometer 4 85 watt 6500 cfls Everytime soil dries Sent from my SGH-T999 using Grasscity Forum mobile app
mg is generally too hot of a mix so that is likely an issue, your ph is most likely imbalanced, and you have a lack of aeration in your soil From those pics they look thirsty as well. Don't want to dry the soil out completely before watering.
Make sure theirs holes in the bottom of your cups for drainage, and of its miracle grow try watering with RO water and make sure it gets some runoff, kinda like a light flush. Sometimes strange cupping like that is from fast growth. (Anyone else comment on this?) Maybe you have low humidity.