I recently acquired an elongatus piranha from a friend of mine. I introduced him to a tank of mixed cichlids.After about 10 minutes I had a very full elongatus and only 2 cichlids left. I then moved him to a 75 gallon tank by himself. The tank is fully cycled with a ph of around 6.8. The temperature is kept and 80 degrees consistantly. I am not new to the fish keeping hobby but this fish stumps me. He will eat any cichlid that comes anywhere near him as well as an hepsetus odoe ( nearly twice his size ) and a couple of large congo tetras. He DOES NOT touch feeder minnows guppys or goldfish. Nor does he eat the zebra danios that my friend was feeding him. The only thing he shows interest in is the big red devil in the tank across the room. I am currently running one eheim 2217 classic as well as a seio 1100 powerhead for constant water movement, which he seems to like. the bottom of the tank is bare but has a dense carpet of algae. My nitrates are at 0-5.0 and my nitrite levels are undetectable. Single tube t5 light. He will not eat any dry or frozen food. Does anyone have any ideas besides starving him because he hasnt eaten in 3 weeks !?