i always top as seedlings at the 3rd or 4th node...

you already have a nice set of secondary branching happening so if they were mine i would not top at this stage unless planning on vegging for another month. if so, i would do it asap so the tops can recover enough to regrow for flowers.
del... Reviewed by del... on . When to top and begin 12/12 Day 28 from seed. AK-47 seeds from Serious Seeds 250W HPS Ebb and flow Hydroponic unit Ionic nutes w/ Floraliscious supplements and Hygrozyme When should I top? When should I 12/12? As you can see, space is in issue, and I'm only running 250W start to finish. Rating: 5