Thanks for the info!I have had the monster Luxo for a little over 2 years, I got her and a male at the same time in a 13.5 gallon tank. Around august that year, Luxo decided she didn’t like that clown and killed it.
The new one, sharkbait, was added summer last year, and they immediately bonded and have been doing well together since.
My recommendation is to get two of the same or similar breeds and one significantly smaller than the other to maximize chances of success.