There used to be a video of a Flowerhorn being kept in a saltwater tank. The video is now set to private so it can't be viewed anymore.
as for the green and orange chromides they are fully brackish species that can sometimes be kept in freshwater. this isn't an isolated occurance either, Datnioides quadrofasciatus is also a brackish species that does well in full fresh water.
Amphilophus Hogaboomorum, Carpintis, Persei, Motaguensis, Jack Dempseys, synspilum and Parachromis Friedrichsthalii can deal with brackish conditions, and Nandopsis Haitiensis, Nandopsis Tetracanthus, vieja maculicauda and Mayans can live in full marine conditions.
http://www.wetwebmedia.com/ca/volume_6/volume_6_1/central.htm
Cool info to know!
Sent from my iPhone using MonsterAquariaNetwork app
s-there is debate about certain populations becoming their own species. The ones found in saltwater might be a different species eventually. Mayan species found closer inland might not have the same salinity tolerance
I’ve seen those conjectures and there’s not a lot of evidence to indicate that they are a distinct species. A subspecies maybe or just normal regional variation.
Suffice it to say, the ones found in Florida appear to like salt. They have been found in Tampa Bay where the salinity can range from 15 - 38 ppt.