Sweet skunk autoflower

Plants are really starting to look good now. I think the lst has worked, but never grown this strain or used lst before so don’t know the benefits it’s having (please comment to let me know thank you). 1 plant is showing signs of calcium deficiency as it has stunted growth compared to the rest and has a couple brown spots, so I have flushed the plant using 5x as much water as normal and will see if the signs carry on.