New cardinal fish

[Kapachuka3]

Just got three pajama cardinals and thinking of names and I’m pretty sure I have 2 females and 1 male but can anyone confirm?

 

[Uncle99]

Very difficult to sex this fish until they mature, pair off, and mate, IMO.

 

[Kapachuka3]

Very difficult to sex this fish until they mature, pair off, and mate, IMO.

Ok I think I figured it out though and it seems like the biggest fish doesn’t like the others and seems to chase and kinda peck at the others will it Escalade so that one dies? I hope not