First Grow

Don't top it, whatever you do! Autos do NOT like to be topped or have any major stress inflicted on them! They don't have time to recover from it. I'd wait a bit to do the LST ... you want to see some stretch between the nodes - and then, if you don't want to bend them over, you could do something as simple as tucking the large fan leaves under and behind. Looks like it's going to be a very nice grow - certainly looks good so far! Good luck!

Either what is said down below or genetics. Id do more research into it. My 1st answer makes no sense when you look at your other plants. Some sort of mutation. Let it grow out and see what happens. Nothing can spread unless that pot is in the same area and you get overspill and another plant sucks up the water. Do some more research. But looking closer at it. I'd say it's just mutations.

Hey pal. Your plants are just hungry. Supersoil is great. But you are growing autos, which can be very demanding on P-K. And your soil at this point is just slightly lacking that extra kick your autos need. If they were photos at this stage they'd be fine. But as I said, autos are much more demanding. You can add some powder adative. Or some worm castings to introduce some extra nutrients your autos are lacking at this stage in coming to the end of their life they are seeking that extra kick and are just showing that. So worm castings or high grade soil and a few cm on top or some powder ad and pour water on top and it'll give your plants that extra kick they need. As for microbial life, I do not see any negative affects such as die off from rot or random rust spots running down the edge of your leafs, but if you do ever run into bad micro life then all you need to do is run some h202 through it for a week with syth nutrients. But as I said, you don't have microbial life, just hungry gals. Good luck.