Only keep my 3 rtc (36" to 45") with a silver and rtg aro. Never had a problem with the rtc going after my aro's yet. I have rays and a 27" tig but not with my rtc.
I find in my big tank it's no problem. My RTG seldom goes 2 feet below the surface and the frontosa's (a few dozen) never come within 5 feet of the surface.
I've never tried it in shallow tanks because frontosa are a deep water fish. Several of the adult frontosa in the tank are rescues from...
I keep aro's in both of my big tanks.
I give a list of the fish in my 52k in which I have a RTG (24") and a silver(30"+-). To see some of the fish in the tank with them watch the short videos (2 minutes) in my signature.
number
in tank genus-species description
1 Zungaro zungaro...
Any pictures yet??????
Just a note: The fish was reclassified and renamed a few years ago and is now named
Brachyplatystoma tigrinum (was Merodontus tigrinus) common name: king tiger
Any old books will have a different fish listed under that name. Planetcatfish are up to date on this fish...