08-30-2010, 04:21 PM
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It's very rare for anyone to get bitten by captive Piranhas, the only times it really happens is when they're being transported to other aquaria or feel threatened.
Piranhas are not begginer's fish but they're not particularly difficult to keep either, they just require ALOT of space and filtration. They also tend to be quite boring as has been said and the only time they're 'exciting' is when they're being fed. However, I love piranhas and keep a Spotted Piranha myself which I love but is very boring and timid most of the time.
The Black Piranha is a solitary Fish and cannot be kept with ANY other Fish, they get huge reaching nearly two feet in length so will need a massive tank...Awesome Fish though and they are very popular with Piranha keepers and are normally considered the ultimate Piranha.
Red Bellies are from a different genus (pygocentrus) and are shoalers so need a large tank because of that.
Don't understimate the level of filtration, water changes and related costs that come with large, carniverous Fish. You don't need any special knowledge, you just need deep pockets to set the tank up, space and a liking for doing water changes.
There are other species that are less hard work from the Serrasalmus genus, I would recommend S. Compressus or S.Marginatus if you're limited for space but will still need a 150 litre+ tank.