Hello ! If you'r using the full biobizz nutrients range then follow the chart but start with 1/4 of the amount and then slowly increase it to the recommended level if your plants can handle it ( be carefull the chart is divided in 2 , the All-mix xhart and the light mix chart , use the one related to your grow medium nutrients amount). You can start feeding now ( only root enhancer) then start your feeding when you plants will be stronger (end of week 2 maybe ?). I hope it will help you 😁👍