My plants have white specks on the edge

[Recooo]

Hello, I purchased these plants while adults I’ve had them for a month now I haven’t given them nutrients in about a week thinking I was over doing it. Then I started to notice tiny white dots on the plant, I used green cleaner to clean and flush my soil now I’m trying to figure out if I’m doing something wrong. Please help
(Below is a picture of my plants and how close they are to my plants)

 

[PizzaBob]

What’s the media? What’s the nutes and regiment? Temps?
Maybe calcium issue. And perhaps potassium too.

 

[Recooo]

What’s the media? What’s the nutes and regiment? Temps?
Maybe calcium issue. And perhaps potassium too.

The media is coco soil, the nutrients is general hydroponic flora micro, flora gro, and flora blend, I started off with 3oz twice a day of nutrients every other day and I stopped for about a week and a half and just gave water 4oz twice a day temps btwn 65-75 degrees. About 2 days ago I flushed the plants with green cleaner I let it sit for 15 mins then I flushed the plants with clean water and let them drain for 30 mins after that placed the plants back in the tent where I haven’t watered them since.