i have a true perc and an onyx perc that i was hoping would pair. i purchased them when the were both juvinile and had been kept together when purchased. for the first months there was some chasing done and would usually end in the onyx submitting to the true. however lately i have noticed they have not been hanging out together as much and the true perc is hosting my anemone but the onyx ignores it. the real reason i am posting is because today i noticed that the onyx is missing some pieces of its fins and i am not sure if i should separate them. i do have a velvet damsel in the tank which i might also suspect of doing it but i am not sure. the only other fish i have is a purple pseudo that i would not suspect but may also be an issue. thanks in advance.