Unknown strains indoor, soil.

I have 4 babies currently just coming out of sprouting stage. They are either Hashberry, Sagamartha, Speedqueen or a possible accidental blend of said strains. One thing I haven't figured out is, which one has purple stems as a trait. I know it's not a soil, light, water issue, all 4 plants have the same soil, same water measured out on scheduled times, under the same light source. I'm pretty sure it's genetics, especially considering I had bright purple hairs on a previous plant. so has to be genes right?

Nope not necessarily genetics. Plant stem color is not a genetic trait that fluctuates like you are describing.

As of 12/31/12 am, approx 4 days of growth.

No fertilizers yet, just the soil and water.

Here's a photo from today.