As far as Panaque's and Endli's go...I agree on the rather. One of my endli's killed two of my L190's by trying to eat them. But the other Endli's or bichers never bothered the other royals or Pseudas one bit...just that one crazy Endli. I say as long as the tanks large enough and theres lots of driftwood, they should be fine to coincide. Good luck Mark.