Pristella tetras are peaceful to each other and other like-minded creatures in the tank!
That said, this species is easy to scare. It doesn’t take much to spook the fish, so make sure that there are plenty of hiding spaces to give them some peace in those moments.
When kept in small groups or alone, these fish can become even more skittish than they already are. Solitary fish will spend most of their time in hiding and will usually succumb to stress-related health issues.