hiya You have to make sure that whatever mix of plants you use their conditions are compatible. From the succulents I'm familiar with they want a lot less water/moisture in the air than moss but you could alter how you make it such as not sealing it and spray the moss daily, this means the succulent wouldn't be too wet and I think succulents like open air (not sure on this, I'm not too familiar with them). Ferns work well with the moss in closed terrariums. Good luck!
I've done miniature ones in the bottles that essences or food colour comes in. I used the same method but you have to be very aware of how much you are putting in (remember 1/3 filled, 2/3 air). The best plants are those that like a humid environment and are happy without direct sun. Small ferns are great, begonia's and similar.
Good luck! I bought home a tiny snail in my moss once and he lived for about 4 weeks.
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