Hi I have a 60 gallon planted tank with ten Serpae Tetras in it. They've been in there for a few weeks now by themselves and sometimes they school nicely and other times they chase and nip each other. My tank has been cycled and all its levels are good. After I bought the Tetras I heard they can be nippy. I should have researched them more but I assumed since they were Tetras that they were good community fish but I'm having a hard time finding compatible fish. I would like some bigger centerpiece fish they stay near the middle to top since the Tetras stay towards the bottom. Any suggestions would be appreciated. I'm fairly new to this.