Fungus disease? Or?

Does anyone know what this could be? I have two of the same strains that have this on the bottom of the fan leaves. The other two I have don’t and I don’t want it to spread. Only day 29 from seed by the way.

Can you provide some info about your grow?
It doesn't look like a fungus........more like a deficiency.

MickFoster said:

Can you provide some info about your grow?
It doesn't look like a fungus........more like a deficiency.

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I’m growing in Mother Earth performance soil its sphagnum peat moss, perlite. I’m using Gaia green 4-4-4 and EWC. I just transplanted in 1.5 gallon pots 3tbsp 4-4-4 kinda eyeballed the EWC and I put some glacial rock dust 2tbsp to be exact because I suspected it could be magnesium deficiency. The leaves were showing signs since they were in starter pots though. I used just the 4-4-4 and EWC in 4inch starter pots. Could it be a calcium issue or maybe a magnesium issue? The 4-4-4 says it has calcium in it though the only thing missing was magnesium. Plus I’ve been using tap water, I have it in a 5 gallon bucket with air stones for aeration and let it sit for about 1-2 days.

My bad if it’s all over the place I’m multitasking right now

These are the two plants

They look pretty good to me.
Sorry, but I can't help..........I have never grown in soil using dry amendments.
Good luck.

how are your temps? they are looking pretty well fed (almost a tiny bit overfed) and no visible deficiencies.

crimsonecho said:

how are your temps? they are looking pretty well fed (almost a tiny bit overfed) and no visible deficiencies.

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My temps are 75 - 78F during lights on and about 65 - 70F during the lights off. And yeah definitely kind of overfeed I’ve been using the recommended amounts on the back.

Just Two of the same strains have the stuff on the back of the fan leaves. The other two do not.