Disease or killed by another fish?

[MrsBugmaster]

This morning I noticed my female Goldflake was laying on her side at the bottom of the tank and breathing heavily. She has a red spot on her side and red spot under belly at the anal gland. By this afternoon the fish is dead.

A little history, bought fish in March of 2018 as a juvenile. Went through full Qt according to 4 ford and hot rocks method. Has been in 180 DT for almost a year now. My male Interruptus Angel has always from day one, chased the GF but Never did any harm to her. I did notice she has been getting a little skinny the last few weeks. So is this a internal parasite or did she succumb to the harassment of the Interruptus? See pictures. Want to make sure if it’s a parasite I treat rest of fish. Thanks

 

[EmdeReef]

It’s very possible that it’s aggression. Are all other fish doing ok?

Have you added anything new to the tank recently?

 

[MrsBugmaster]

All other fish are fine so far. Nothing new added for many months.

 

[Big G]

Sorry for your loss Stress and attacks with some biting and a bacterial infection probably.