Is this nitrogen deficiency?

I don't know if your issue is nutrient related but Fox Farm Ocean Forest is pretty nutrient hot and in the past I've had issues with nute burn. After my seeds are germinated I plant in 100% Fox Farm Happy Frog and when I transplant into final pots, I mix a ratio of 1 part Fox Farm Happy Frog to 2 parts Fox Farm Ocean Forest, this eliminated the issue of nute burn I was having when using 100% Ocean Forest.

genetic chimera locally can cause such mutations.

Not deficiency, just a "normal" and/or common leaf mutation or two. Nothing to worry about, it will not effect anything.....growth, health, potency, yield,......nothing. Just remember.... no plant will ever have 100% perfect leaves, 100% of the time!

deficiency, no. border line toxicity, maybe. I think the damage you are seeing is from something else unrelated to nutrients. Plants still look fine though.

68° is a bit low too. Try get up in the 70s

They look ok mate don't stress. N tox would have tips down but with a much darker green. Maybe a bit of over watering. Let soil dry out between watering.