you should post in the strain section, however if there short.... i dunno, if they show no signs of problems, and yeilding not to much they might be under fert. but dont take my word. the light could be close enough but not enough lumens, it depends. we need alot more info to give a correct diagnosis. sayin there short and u dont know what the yeild is yet anyway remember they puff the fuck up at like week 5-6, watering schedual? nute level? lights? water ph/ppm? they grow about 3x size in flower. so if i vegged till they were a foot, u would have 3 foot plants about. thats an aproximate though AND alot of strains differ but for most they work the same. i plan i using c99 aswell.