chasing around

I’ve got one fat looking ember tetra chasing other ember tetras away from the middle of the tank during feeding time. Everyone else is getting along fine, it’s just this one that’s being rude. It’s also quite fat and slightly larger than the others so I’m not sure if it’s a female about to lay...

hi  i added a new (hopefully female) curvicep cichlid to my tank today and my other one (been told male) went up to the bag and looked at the new cichlid, after i let her out he went up to her and they swum near each other but now he just chases her around doesn't attack as for say just...