Need advice about TOPPING(PICS ATTACHED)

Hey guys, I have a few questions about my first grow...this is some Sativa strain, veg stage week 2 under 18/6 lights. I'm confused wether should I top those 2 plants or leave them as original instructor . As you guys saw the pics...


1. Is this the right time to do topping? (I'm afraid to mess it up as this is my first grow) other wise I'm thinking to leave them without toppings.

2. I got the seeds from the weed I have smoked so basically I have no Idea which strain is this, the only thing I know that this is 100% Sativa. Can you guys tell what sativa strain is this by looking at it?

3. I'm growing this in a 6 feet closet, I'm afraid this height is not enough as some Sativas need higher space? do you guys think 6 feet is enough?

Help and advices would be highly appreciated

Peace

topping is up to you. sometimes topping can affect yield sometimes increasing it. A grower needs to become familiar with his own grow style, grow space, growing ability, the ability to be able to supply all necessary resources in a timely manner. You have to know your plant and its space before you can predict how it will respond. You dont know what sativa, what hybrid, what % sativa, etc but you do know more about this plant than anyone else here.
why top them for more yield in your small space? will you be able to cool and heat and dehumidify the space? enough air flow? fresh air/c02? stink sock for odors? clone it, flower it now, learn its habits, practice proper garden habits, decide if you want to experiment with your supply after you sample your finished buds.