That does not matter, even if the piranha is half the size of the oscar the piranha will attack it when the oscar is not paying attention and beause of the size difference he will run, I have seen it with my own eyes. When the piranha is almost the size of the oscar it will be food or he will kill it.bobme said:make sure the oscar is bigger then the piranha.
You can try Exodons (Bucktooth Tetras). I had 10 Exo's with 5 RBs in a 55. No space so I was left with 5. Now they're both housed in a spacier 125. Getting more Exo's since theres more space for both.Staubsaugen said: