I would do a few big cichlids... i already have a cichlid tank with mostly small/mediem cichlids and an oscar and common pleco...So i would try only big cichlids... maybe some birchirs...
a solo fish tank with a hoplias malabaricus
im getting ready to build a plywood 150-180gal for one unless i find something else i want to do ... im a piranha guy but i just moved to nc and all piranha are illegal here ... if i wasn't in nc i would DEFF do a black mask elong
Im currently struggling to decide on stock for a 120 and going crazy. Sooooo hard to choose. Especially when you have multiple tanks already stocked differently, you almost run out of ideas.
That's a pretty standard bathtub size. Maybe I'd fill it with warm water and grab a beer. And make sure none of my predatory fish are near mah man parts.