Seedling with underside purple leaves

Why is this happening to one of my girls? I don’t know strain. I believe it’s gelato

Most likely a pheno expression ….

Low temps?...look dry too

Low Temperatures (Likely below 65 °F) and genetics (Gelato tends to purple up).

This early? Stress.

JK-DOOR 420 said:

Low temps?...look dry too

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Watered after photos

Boreal Curing said:

This early? Stress.

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Heater tripped breaker day they sprouted but 80 ever since

SickboyDilligaf said:

Heater tripped breaker day they sprouted but 80 ever since

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It has been 80 °F without a heater even at night? I know from tomato plants cold temps will make the bottoms of the leaves black/purple like this. I highly doubt the genetics are purpling up in veg. Normally most genetics will start showing purples, pinks etc in mid/late bloom.

I'm guessing still cold temps and possibly not watering enough resulting in a deficiency.