Ya bra, I know about your Meta Halid system, remember I way joking around, saying that you should send it to me at the end of my 2nd post.

I don't think you have room for a mother, I've never done that way, I just clone a few good looking plants, and flowerer them hoping one will be female, then I throw out the male clones. This way functions like a continues cycle. If a plant pre-flowerers you can go ahead and clone it knowing it's females, and you don't need to keep this huge mother anywhere, or male clones. Pre-flower should happen 30 days after seed started.
Here's what I know about topping, growing from seed you need to wait 30 days, in which time you will hopefully see pre-flowers anyway, so this is a good time. From a clone you can go ahead a start topping once the plant is rooted. So topping is better on clones, but I have done both. read up on where you can make cuts, but remember to pinch it off, so "blood" doesn't come out, or cut at 45o angle so "blood" can flow off, and not make a pool up top there.

Also you never answered my question concerning, what is that black thing in piture "box-2.jpg"?