He doesn't bother other fish unless it's feeding time. He'll bother other eels if he wants their cave, though. Your banded eel just needs to be okay with surrendering his cave or sharing it. I don't know how the banded acts to judge if it could handle that (as my miliaris couldn't, but he was a really timid fish). JRF should get back to you soon. I got my dwarf and Brazilian from them, and both were good experiences.