bonsai

Hello, I'm the process of getting a vivarium set up for some future mantellas and I came across this cheap little bonsai and was wondering if it would be safe to include? I honestly have no clue as to what kind of bonsai it is and I'm hoping to identify it and make sure it won't be a...

I had this plant in Japan and also saw it in Korea, but have not been able to find it in America. In Japan its called iwahiba. In America it might be called selaginella tamariscina, but I'm not completely sure. It's obviously a type of selaginella (club moss/spike moss). My biggest question...