@Growyo Hi mate I like start one week after germination with a quarter strength Mix of some root booster like
seaweed/kelp and a nutrient mix suited for the vegetative stage ie more nitrogen than P+K.
It is especcially important not to overwater as your roots need oxygen just like us and too much water can inhibit
the plants ability to breath Hope this helps mate and anything you else feel free to send me a message and i will
do my best to provide an answer Good luck