My best advice: start with Shellie's alone. One species, no tank mates. Learn their behaviors and understand them through experience before attempting a cohab tank. Will save you lots of time and money, trust me. My Shellie tank that brooks spoke of earlier was a major pain to get just right and took me several weeks before things evened out. Something as simple as upgrading the tank size made my entire colony crash.
To be honest, a bow front would not be my first choice for Shellie's. Brichardi live in family units and wouldn't be a terrible choice for this tank, but again, no tank mates. If it were my tank, I'd either replace the tank with a 40breeder or do a pair of angelfish and some dithers (which I see you had previously)