Yep. pbass attracted to shiny fish. Best if shiny fish can endure some nipping. My silver dollars have scales flying now and then. But they are just oblivious. Nothing seems to affect them. Definitely need to make sure Aro is pretty big or pbass will eat them. My 7-8" bass will eat fish 4-5" long.That size tank will help but as said above you will likely see some chasing and nipping
And what will I feed my aro I'm new to this fish but I do research on my fish so I no how to care for them and I forgot to mention I have a African butterfly in the 55 to is that alright if not I have 2 other tanks