I'd had a feeling it was going to happen soon, because he's become far less social in recent weeks, but I had to say goodbye to my male halfbeak a short time ago. He was born during the Italian F1 Grand Prix '13 to a female who must have been pregnant before purchase ~2 weeks previous, I missed saving his sibling born moments earlier by seconds due to canabalism. This fella grew into a mischievious ~4cm TL that lived in my tank of little peaceful fish for 12 years, often harmlessly stalking other midwater fish and sometimes trying to eat food far too big for his slender mouth, given the condition of him when found against the side of the Fluval U4 filter I suspect he dies yesterday on the day of the Italian F1 Grand Prix.
I never did conclusively identify which species of Halfbeak he was, one of those fish that certainly in the past were often misidentified.
A good innings for a fish that typically lives ~5 years!