12 day old autoflower has brown spots please help ?!

I’ve grown before never had this problem and rn I’m growing an additional plant other than this lady here.. she however is doing perfectly fine.. I’ve fed my plants in small dosages. 1ml of grow 1ml of micro 0.5 ml of bloom . This was day 7 growth was amazing after feeding .. now day 12 I see brown spots on this one .. may i also add this plant is growing slower then my other one in the tent.. I am thinking the spots are maybe calcium deficiency idk?

Natural light pics when asking for help


Is that Coco? If so watering/feed daily?


Ph?

Ph 6.3-6.5 watering I water not so much maybe that’s the issue I fed day b4 yesterday then yesterday fed it just some basic ph water prevent any burns . And it’s ocean forest soil

It's hot soil,just give it time


Tap water or ro

Tap water then I ph it

I 2nd Bob, Ocean Forest is hot out of the bag

If you’re referring to those little splotches of discoloration, they’re probably just splashback from watering. Too random to be a system problem, I think.

Stop ph’ing your water. Your soil has buffers. Use it straight from the tap.