convicts tank

Hi there! I currently have a 55/60 gal tank (its rounded in the front so im not 100% sure on the size) but it has good floor space and lots of swim room. I have 2 small bichir polypterus that keep to themselves I only see them during water changes and occasionally when they're eating or darting...

Debating if I want to start another tank up with an empty ~36gal bowfront.   my only debate is I feel bad for what evere fish I decide on putting into it ...as they would look over and see the 180gal tank next to them.. Is it foolish to think I being mean by not giving new fish the same size of...