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A couple of weeks ago my swordtail was found lying at the bottom of my tank gasping for air. When i took a closer look at him, the inside of his head was red and looked bruised.

There were no outer marks to his head, only inside. I decided to quarantine him in my other tank. I was upset because i thought he was going to die, but he survived for the next few days and the redness inside his head faded away.

He's doing good now, and i've successfully put him back into the other tank, where he seems fine. I was just curious as to what could have caused it. I'm not too sure what a brain hemerage would look like in a transparent head but it seemed the most obvious thing to blame. Anyone have any ideas what it was and how it was caused, and can possibly be prevented?

Do you have any fish that are able to bite down on the swordtail's head?

well i do have a beta and he does chase the other fish around. but it just didnt look like he had been bite cuz his head was still smooth. It was like there was all blood in his head.