I used to keep a trio of red hooks with an RTG. The three red hooks would beat on each other mercilessly, maybe I had all males? In any case, I ended up with one as the other two just got too messed up to keep. And then when I had only the one, he became terrified of the RTG and just cowered in a corner all the time. So I finally got rid of him. I'd like to try again, maybe I need a larger school?
I was warned about red hooks, before I kept them w/ my aro's. I never listened. I bought a school of 5 red hooks & 3 silver dollars that were half the size or the red hooks. The largest hook I had was over 5 inch in dia.
I had them in the tank with my VIP XBG and one day I noticed a little nip out my aro's anal fin. I let it go for a while and the aro's fin healed.
Just after the aro's fin healed I noticed a larger nick on the arow's anal fin again.
That was it, I had to fish the whole school out including the silver dollars and banished the school forever.
I kept one of the small silver dollars that had an over shot jaw or what we would call PLJ in aro's. I named him Sammy Davis Jr cause he reminded me of the late singer. With his deformed jaw he can't really do any damage, and he,s only 2 inches.
The Hooks and the Dollars really added beauty and they never stayed in one spot in the tank but, I wasn't going to risk my Aro.
I think I will try some yellow tail tin foil barbs next time. Noce fish w larger mirror like scales compared to their red tail or blush cousins.