Mazzdog66 said:

My tops are now lime green.

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It's not bad and somewhat common for new growth. More than one thing can cause it. Maybe it could use some nitrogen. Too frequent watering can cause it.

Mazzdog66 said:

- Is it under or over watering? I water every 3 days (about 8oz) and my indicator says “dry”

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Probably not, but what's dry for a moisture probe might not be dry for a marijuana plant.

Mazzdog66 said:

- light is 10” from top of plants, run 16 on / 8 off

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That could be too close. How powerful is it and what is the percent power?

Mazzdog66 said:

- have done 1/2 of feeding of Fox Farm Liquid Plant Food

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Seems a bit soon. What type of soil is it in?

What is it growing in? Looks like you don't need nutrients yet. You may also have dry pockets deep in the pot if your moisture meter is reading "dry" or below 3......