They were topped for the 2nd time on 12/26. I'll let them grow to the 4th node then top above the 2nd node. I'm removing the growing tips below the 2nd node. They're growing great. No problems as of yet. 2 more toppings and I'll drop the screen in and flip the lights. I'm hoping the manifold will distribute energy evenly across the screen. I really like the structure of the mainlined plant, I've already decided my outdoor plants will all be mainline this year.
Merry Christmas and Happy New Year to all the growmies.