Tips and advice for Fittonia (Nerve Plant) Care in Terrarium

Good morning everyone!

I just got my first plant yesterday, so I’m a beginner in indoor gardening. I got a Fittonia (or Nerve Plant) and after checking on the web I decided to keep it in a open terrarium. So I was wondering… Is it a good idea keeping it in a open terrarium? Do you have any good tips/advice on how taking a good care of my plant? 

Also I’ve notice there are some brown discolouration on few leaves and I was wondering if there is anything that can be done to solve the problem. I will attach pictures down below.

Thank you very much in advance to everyone will take the time to answer!💚🪴💚

Ps: 🌱This is my small terrarium 🌱