looking for advice. My goldfish died and my black Moor was looking lost so I bought him another goldfish for what was meant to be company. Quarantine was over today so I put him in the tank, he was a little shy but ate fine. tonight he's been chasing my Moor and appears to be tail nipping. Should this calm down or Should I remove him and put him back in the small tank? I'd be devastated if anything happens to my Moor