Big cichlids are always cool, oscars, green terrors, frontosa (My favs), etc. Possibly a tea cup ray or two.... A large group of exodon may work, and would likely be active and fun to watch eat. Catfish are cool,plus there are so many to choose from. Upside down cat species, glass catfish, etc. Pufferfish are cute and personable. A FW Cuda are always cool and generally active and fierce. Or simply a giant school of small fish, like tetras. Angelfish and discus are nice large schoolers. And hatchetfish are active plus have an interesting anatomy.
Yes, big cichlids are neat and all but to a non hobbyist they look like any common fish nothing over the top crazy! the first time i saw a stingray in somebodies HOUSE- i thought it was a fake decoration. It just could not be real! For non hobbyists it is amazing the first time you see something like that. But as a member stated it could not live in there for life. Some neat fish are:
Ropefish
Snowflake moray eel (saltwater)
Gulper catfish (this thing will defiantly be "different".)
Water cow
But a single large species of freshwater puffer like a fahaka is your best option IMO. EXTREMELY interactive (like a cichlid) but not the traditional looking fish. A large pufferfish that follows you around the room is going to start a conversation.
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