Some uros live in fresh, some brackish, some in total sea water(Isla de Mujeres strain), some of these are very different in appearance from others, and may at some time in the near future be given separate species status
When I had uropthalmus, they were fairly docile, even when they spawned in a 150 gal cichlid community tank.
Your's (OP) appears to be a female (by the dark spot in the dorsal).
In nature females and sub-dominant males live in large groups, the dominant males hold territorial areas driving all but receptive females away.
The large groups in my video from Cenote Azul below, appear to be mostly females, notice many wounds and torn fins.
https://www.youtube.com/watch?v=Zb3v0VJTg5c
the still pics below are from Florida in an area just north of the Everglades.
Thank you for your informative post, that video is amazing! So does this mean the mayan I have would be happier with other mayans in the tank? After everything i've found out now i'm glad it turned out to be a mayan rather than a festae, they seem like rreally interesting fish.
