And I want to say I am not trying to be a know it all or smart ass I was just implying you have the start and main unit so pretty much as soon as she pops move her to the grobo solid or premium which ever you prefer or if your growing tent to your medium of choice! Sorry if I showed any dickesh vibes.
When you say you didn’t add the extension, do you mean you added it after the leaves grew to the top?
Example: The part I circled in the red is the second extension and the actual light is the first, so if you had them both on thats why your plant stem grew too tall.
The light clicks down onto the base without the extension. 
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