PotG & Punch Line -- Mars Hydro FC-E4800

Transplanted September 4 PotG into 3 gallon ME coco/perlite PunchLine into 1 gallon plastic pots hopefully until they show sex. Running under Mars Hydro FCE4800 now. It’s a beast of a light and has amazing coverage for a 4x4. I’ve been itching to get a bar light like this for that superior even light distribution. Rinsed out new coco and then fed each one with 1ml armor si 4ml calimagic 2ml micro 2.5ml gro 1.5ml bloom I think they’re gonna start takin off in the next week! Especially under this badass light Day 17 - kicked it up a notch in feeding with a full tsp of micro, grow, and bloom per gallon.. probably a bit much but they look like they’re hungry. One PotG and one PL has the same small brown spots developing.. they’re too young at this point to put too much thought into what that is.. and no others are showing it.. I’ll address it if it’s matched with any other symptoms but for now they’re fine. UPDATE ugh ive got my days messed up i think - im not used to keeping that much track of vegging plants but today is Day 21 I believe? i have to go back and check but i'm worried about coco causing cal and mag issues so I fed today with epsom salts added. Theres plenty of calcium in micro (5%) and in calmag (5%) but only 1.5% magnesium in calimagic.. and the spots are looking more like magnesium deficiency than calcium with the spotting.