Atlanta Braves Baby! said:
what are these Caribas that everyone is saying i should put in? Sorry I don't know all the differnt kinds of piranhas yet. If I put 9 rbs in there how many Caribas should I also put in?
Pygocentrus Cariba looks very much like the more common redbelly (P. Nattereri), but it has a very distinct dark humeral spot (ie. just behind the gill plate), see below:
In general, cariba seem to be a bit more territorial/agressive than redbellies, and therefore need a bit more room per fish: that's why people advise either 8-10 reds, or about 7 cariba.
If you decide to get 9 reds, I personally wouldn't add cariba....