That's insane, yours dorsal fin is damaged too?? Mine is damaged in the EXACT same way, where did you get yours? Tank looks nice btw
BP is not shy fish by nature because they have Midas gene, so eventually they will come out. It won't work with Vieja species, because they are naturally shy fish, and keeping them alone in a bare tank will terrify them more. Dovi, Midas and FH are naturally bold fish and keeping them alone in a bare tank will make them more aggressive. It all comes down to genetic, not just environment.