Color of leaves

soon, but if no hint of slowdown, i'd wait if unsure. coco was likely buffered and has some initial nutrients? check label or if you pepared it, etc... if not, one dose and then water-only irrigation after that is fine to re-hydrate and avoid buildup. seeds are packed with energy for upto 2 weeks.. Watch those cotyledons. they'll be the first to show a hint of a deficiency... best way not to stall anythng or foundations for buildup of nutes later as roots hit areas rpreviously uncolonized, yet contain tons of nutes.

I don't know fox farms recommendations but here is what I do know. Coco is inert meaning it provides no nutritional value to your plants. Coco Loco is amended with some additives to the coco (nutrients) but it's not enough nutrients to last a whole grow. Once the food in it is used up its just inert coco (and I think perlite which is also inert and just helps aerate the medium). At that point, you should expect to need to feed it like any other hydroponic medium, not like soil. Happy growing!

Looks decent so far! Your shouldn't have to feed it for the first 3 weeks, a good indicator is when the cotyledons (very first set of leaves out of the seed) start to yellow. When you see that, you can start with your nutrient schedule. Just take it easy on the water till she grows up some and you should be fine. Peace