Fish it out and fry it up if you want to keep other fish in your pond. Piranha can't be trusted with other fish. Even with that much room. But he may not necessarily be the culprit. Is one of your RTC much bigger than the others? They can be aggressive and have no trouble swallowing a fish 1/2 their size
having owned a small RTC and a dwindling shoal of red bellies(separate occasions of course), I highly doubt your piranha to be the culprit. my moneys on the catfish as well
I had a rtc×tsn hybrid that would take my peacock bass out at night when catfish hunt ate about 80$ worth of bass they don't give a **** eat anything lol
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quite easy to catch get a stick get a piece of bloodied meat, and use a longshank hook, or a hook with a metal leader, any fish shop has this. u should fry it up or eat it like a sashimi quite delicious!