UPDATE: CRIKEY! i just put my two arowanas (from this vid) in the pond. everything looked great for about 15 mins until WHAM! my largest 38" TSN pounced and grabbed one of the silvers. luckily it only grabbed the tail end of its body so the arow managed to wringle out. i quickly put them back in the tank. lost a few scales but nothing a bit of melafix and TLC wont fix. almost had a HEART ATTACK! probs gona wait 6 more months till they put on a bit more girth before i try again!