Some blue varieties include the Peacock Cichlid, Electric Blue Ahli ... Crayfish aren’t truly fish, despite their name. They are freshwater shellfish that we usually imagine as a deep red ...

Like Oscars, blue acara are tropical fish and require a large tank with ample swimming space and well-maintained water.

If your aquarium feels a little blah, maybe it’s missing some bold personalities. We’re talking fins that flash like neon signs and colors that could outshine a fashion runway.

Many of the blue fish were zebra striped, while one of the yellow varieties had horizontal streaks of black and white. The rocky lakebed was like a collapsed cathedral. The cichlids, mostly two to ...