sexing

I bought a pair of young banggai cardinals three days ago, but one of them died suddenly. It got sucked into a powerhead and beaten up (idk if it was postmortem or perimortem), so I can't tell if it was the male or the female of the pair. The store sexed them for me, so I'm not even sure if they...

Can anyone tell me what kind of anthias this is and why it is changing from all orange to this? I'm assuming it is a combination of age and male vs. female thing. I bought a pair and the other is not changing at all. The caudal fin also appears to be growing into a lyretail. Any info would be...

Afternoon all, Just wondering if anyone knows how to tell the male and female niger triggerfish apart?

Can someone try and confirm this is a male…. This one has 1 sticking out nub and like a flat one which is making me double guess……while my other has 2 sticking out and is clearly a male…..Any help would be approximated thanks ( Both these pic are the fish with 1 clear nub and a flat one )

I suppose my question is, would it be possible that OG clown never actually made the transition, and has just been exhibiting the behavior thusfar? Today OG clown is eating more than I've seen it eat in the past month, which is a good sign, but I'm just nervous about if the newcomer doesn't see...

I bought supposedly 2 males and 1 female Cardinalfish (attached images below), however im a little less convinced and would like a second opinion if thats at all possible. Male Male Female Any help would be appreciated :)