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I added 3 Bartletts and 3 Lyretails to my 180. Pretty sure the Bartletts picked off the lyretails. The Bartletts have been in my tank for 2 or 3 years (can't remember). One is definitely male, one seems kind of male (sub-dominant male?) and one seems to be female. The dominant male keeps the other possible male in check, keeping him in the rockwork. They're a very pretty fish and mine seem to have gotten nicer looking with time but they're too aggressive for my taste and don't spend too much time cruising the tank, mostly dominant male hovering over sub-dominant male in the rocks with female nearby. Maybe in a bigger tank or if you kept a group of more than three where any aggression by the dominant male could be more dispersed, things would be different. I'm pretty sure if I tried to add more to my tank now, they wouldn't last long. I'd get something different next time.
Matt
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