Plant seems to be growing too tall

Hello everyone!

I’ve just got myself a terrarium that’s small and cute. The seller also mentioned that it’s rather easy to care for.

Nonetheless, got a few questions that I didn’t get to ask.

Can I check if the lil plant in the Center is growing too fast, is it an issue? It seems like it’s already reaching the cover of the terrarium.
It was rough transporting the terrarium back home and I accidentally dropped it as well. The sides are a lil dirty due to it dropping. Can I clean it up with like tissues or cotton buds etc? Or it’s not recommended to do it.

Would love to hear your responses.

by Hweeeeeeeeee