Blue gelato gorilla skittles purplePunch

1st time using a scrog and to be honest in this set up I changed every think from hps to led soil to coco advanced nutrients I only stated a grow before this one using was using bio bloom before but I think I’m not doing to bad there are a few white spots I’m not sure if I don’t think it’s a pest could be wrong any help would be great this appeared after I washed with bicarbonate soda at the start of this in veg there was a little white spores on the leaf mildew which didn’t come back but I did muck up the ratio of the mix so could well be my mistake but do look a lot more heathy