Barney’s farm LSD in coco, led lights

I’m starting a grow with Barney’s farms seeds, in coco coir mixed with worm castings, and a light fertilizer and 30 percent perlite in one gallons for now. The tap roots popped in one day extremely fast didn’t put them in water and today they have sprouted so off to a great start. I’ll be using the same green planet system, should I add cal mag to my feedings now that I’m using coco. Happy growing any advice is appreciated