I have had numerous piranhas, and in opinion the oscar would be gone in a matter of days. Only hope is to always have feeders in the tank. The red belly's that I had killed for "fun" they would take one bit and let the fish die, a real mess. Just my 2 cents.
Dustin
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75g (7/04), 4x65watt cf, ASM G3, 65g refug, turbo-twist UV sterilizer, 2 koralia, Quiet One 3000, 123# LF, solar fairy wrasse, blue hippo tang, banggai cardinal, green chromis, O. clownfish, royal gramma, yellowheaded jawfish, serpent star, xenia
29g (9/04), 65 watt cf, coralife needle wheel, wet/dry, 1 koralia, 25# LF, coral beauty, b/w percula, yellow watchman
75g (8/07) 4x65watt cf, ASM G2, 2 koralia, 30 g refug, Quiet One 3000, 100# LF, Blonde naso tang, frogfish |