Coco is kinda complicated but I'm new, I'd just transplant in some ffof and your favorite mycorrhizae blend (recharge, great white, i used bigfoot) and let them feed themselves but again i opted for the easy way out, heck i didn't even use light mix for seeds, i used the "to hot" ffof for seeds and they did great, although next time just to be safe i'll put some light mix in a pocket around the seed.
The only thing i do is ph down my 8.1 tap to 6.2-6.5 until i get to around week 4-5 in my soil then i'll 50% nute or maybe 25%, not sure yet as i'm not there yet.
I look forward to watching how your batch does.