Blotchy discoloration - please help.

Currently day 17 from seed hitting water. Medium is in 'Coco' chips or mulch. I buffered with a Pre-sow coco soak in 150% concentration cal-mag to prevent deficiencies.

Jacks 321 - 'Clone' formula @ 1.0EC or 550 ppm (or so) + 1/2 tsp Recharge per gallon. I water/feed (fertigate) Once in the morning (about hour after lights on) and another after mid-day. I only water until 10-20% run off.

@Canna Montana on paper everything looks okay to me but I have only a couple of runs of coco under my belt. I figured out quickly it wasn’t my style. It sounds like too much water but like I said I’m just guessing. It seems too early for any type of deficiency so it will be lockout or a genetics issue IMO

@TnA.Homegrown I've watered more times in previous grows. At some point it just becomes excessive if you don't have an auto-drip system. That is the great part about growing in coco. Even when Coco is at its highest saturation it still has plenty of air in the medium so it never drowns. You just have to make sure water can flow through easily. Useing perlite helps or in my case straight 'coco' chips/mulch. No perlite needed. This is why you're able to water multiple times per day with nutrients. You're essentially washing the roots with PH'd nutrient water. Essentially rinses out the previous watering and exchanging it with new. I have MAGICALLY never have had a deficiency in coco. Only in soil.

I was referring to the seedling you pointed out. Said it looks like a mutation. Yes, the first set of serrated 'leaf' came out a single leaf. the second set appeared blotchy and discolored as you can tell.

I agree with @TnA.Homegrown, probably just a harmless mutation or maybe the start of Variegation which is also pretty harmless.