POS 33 Day 19 from seed, FFOF

Take a look at my POW33, its 19 days from popping out of the soil. Its fixing to get transplanted into a 3gal smart pot (I know it needs watering), but before i did it, i noticed a little ywlloing on the bottom set of the leaves. This looks kinda like N def to me, but wanted to make sure so i could treat it before transplanting it. All plants of mine are grown in 100% FFOF. Vegging plants get CFL light. A decent amount of it.

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As you could have guess i misspelt the title of this thread

After a watering of straight ph'd tap water, the symptoms seem to be progressing negatively.

If anyone can give me some insight, it'd be helpful. I dont think its a N issue at this point, haven't had much time to research the last few days.

Well after looking at the sticky, i decided that it must be mg def.

So i fed it again with 1tsp of cal/mag in the gallon of water, didn't feed it a full gallon, bout half probably. Hoping the overwatering issues wont be as bad as the mg def.