day 8 for my two cream auto plants (caramel cream auto) and no problems at all, since it's coco/perlite only fed it phed water with cal-mag+ until yesterday (day 7) they were ready for their first feeding I can tell from them being a little bit pale wanting that nitrogen... cmh lights up to ceiling until 2nd node then going to 36" height rest of veg...feeding for first week= 1ml cal-mag+/1ml GH grow and bloom/1 ml gh micro/2ml of bioroot...if that's not enough will up the gh nutes in a few days, seeing how the plants respond first to this light feeding schedule that schedule is per gallon and since they are young wont water till run off till 2nd node, will use that 2 days straight 3rd day just plain phed water till run off the whole grow so that every 3 days getting all the salt build up flushed it's how I used to grow years ago and got great results 😀