18 days old from seed.

this is my first grow but from what i know you should feed from day one in coco. Mine were 3-4 times that size a day 14 and i used 1/4 nutes from day one. But again i am a newb so not expert advice,

give them nutes. coco is inert and has no nutes. the seed itself has food for the plants for 7-10 days so your plants are ready for nutes imo.

Thanks all ill be feeding them coco A/B