yeah I think I know what you mean about the cotyledons..you should be fine if your top new growth is healthy.
I have done FIM, normal topping and super cropping. Not sure how you are growing, but IF you are putting a bunch of plants close together like stinks system then you will not want to FIM. Your billions of branches will soon cover each other and pointlessness will ensue. Try super cropping. It is very easy. Another advantage is some of your plants will be males or hermo from seed. When you pick those ones out you can super crop the other plants into the space where that plant was. No space is wasted.
I've got the same clone/veg setup as Stink but, I've only got six plants going right now, 3 Hindu Kush, 3 White Rhino. They've covered the entire top of the container. I think I'll play it safe probably just top them this time. Maybe the last one I move over I'll get a little tricky with. It's probably going to be my smallest Rhino, he's kind of a runt comparatively speaking to the rest. If supercropping or FIMing help her out, great, if not, small price for experience.
I'm still looking for some pre-flowers to determine sex.
Thanks for all the help.
Quick story about Stink's High Times Issue.
I finally got a chance to run some errands so I go to the mall that has the Barnes and Nobles. I grab the issue, congrats again Stink, and wait in line. When it's my turn, the clerk says hello and asks me if I found everything ok. When she realizes what I'm buying, she says "Oh what a great issue, you'll love the part about aeroponic cloner set up". I told her about the website and she said she'd check it out. I just thought I'd let Stink know he's even loved at Barnes and Nobles. LOL.
I'll throw some pictures up by tomorrow night.
Anybody else in Washington state going to the Cannabis Cup Monday?