When attempting to bend the main cola on the Gorilla with plastic clips (never again), it snapped and hung on just the tiniest thread, so I involuntarily had to remove it completely, thus topping it, which I never intended. The plant does not seem to mind at all and the side branches started lifting up as if trying to take over and compensate. So far, Northern Light is the biggest mystery for me - the leaves look strange and it has the slowest growth of all. Even the Purolematic, which started last and was the smallest turned out to grow bigger. I also added 2 fans to help circulate the air inside.