I'm surprised to see
Tilapia being listed as more prevalent in the USA than the UK, but my 35+ years as a tropical fishkeeper has probably skewed my view on this.

Though I have to admit that my first introduction to these fishes came courtesy of an American fishkeeping book, spoken of in hushed tones among those in the know as "the venerable Innes book", after its author, William T. Innes. The book in question,
Exotic Aquarium Fishes, was the first truly scientific treatise on tropical fishkeeping, dating back to 1931, and even though some of its contents are obsolete today, it's rightly recognised as setting a standard that subsequent authors struggled to match.
The entry therein on
Tilapia mossambica is interesting to read in its own right.
However, the Genus
Tilapia was used as a sort of taxonomic dumping ground for many years, and subsequent revision has moved many of its former members to their own Genera.
Tilapia mossambica itself was moved to the Genus
Sarotheordon as far back as the late 1970s, after the pioneering work on Cichlid phylogeny by the late Dr Humphrey Greenwood. It's now been moved to
Oreochromis, along with several other commercially important food fishes that were formerly in
Tilapia.
Many members of the "Tilapia assemblage" are too big to be practical aquarium fishes, except among specialist keepers prepared to build extra large tanks for them. However, some of them have beautiful markings -
Oreochromis tanganicae is a beautiful shimmering turquoise with scarlet fin edges, though at 17 inches as a fully grown adult, it's a candidate for a specialist (and very large!) aquarium. Sadly, several of the species in the Genus
Coptodon are critically endangered.