About six months ago I started a tank consisting of 3 clown loaches(1.5in.) and a reed fish(1ft.). A month later I added an irridescent shark (1ft.) and 2 bala sharks (2in.). Then, two months later I added my first red belly. Currently, I am down to the 3 clowns, the reed fish, 1 bala and three red bellies. The 2 new piranhas are about 7 inches and were eating feeders prior to my purchase. Let me add that the missing fish weren't killed by the piranhas. My first question is do my non-piranhas have a chance of surviving? Second, will my original red belly start to eat feeders now (it only ate flakes before) and will it get along with the other two? Third, my original red belly ( at least I was told it was one) looks very different from my other two. It is much darker in color, doesn't have the extended lower jaw and is a lot faster. However, it has exactly the same fins, has a red belly, is carnivorous and schools with the slightly larger piranhas. Is this a red belly? Is it a red belly mixed with something else? Will it get along with the others even though it looks different? Lastly, how can I get them to be more aggressive? They seem very lazy or spoiled and wont eat. Are the other fish skrewing up the chain? Any info on these guys would be appreciated and thank-you for your time. Curtis.