I'm still a newbie as far as piranha keeping is, but I still have an opinion here. Not flaming, not being nasty, but stating my piece.
I was all for getting a shoal to keep with my RBP I have now. BUT, upon the realization that he could be eaten by his shoal members, I have decided not to get any piranha buddies for his tank. Sad, yes, mean, perhaps, but I'm looking out for his safety, since I'm attached to him. And you never put a fish you're attached to in a piranha tank......
Also, until I'm good and ready to buy 3 or 4 more piranhas, (whichever number is more recommended it seems) I'm not getting anymore. I don't have the room right now. A 50 gallon is $150 here, I don't have that kind of money...plus, $30-40 for fish, plus the extra food, and substrate, and decor.....I don't see that happening in the near future, at least while my fiance is footing the bill!!
Now, another 29 gallon ($32) and another RBP ($10 puts it to 42) plus sub ($6), and a cave to hide behind, and some decorative plants ($10) $60 total (rounding up) Sounds like a MUCH better deal!! Plus the food for 1 more really won't put a dent in our budget, since it would share everything Whip eats, and that just makes the food go a bit faster so it's less likely to get tossed out for being gross.
OR, sometimes you just don't WANT a lot of RBPs, I'm not one of those people, I think a shoal would be nice.....someday. But I'm sure they're out there. When I first started, even though I really really wanted a shoal, I just wasn't sure about all.....those......piranhas.
That's like, jumping into a pool of cold water without dipping your feet in first.
I love Whip, and I'm sure he'd LOVE having a buddy or two, but he's going to have to socialize through the glass.
Just because you don't have 3-4-10-20-50 RBPs, doesn't mean you're a bad fish keeper. If your tank is appropriately sized, your water is clean, and well-kept, and your gravel doesn't make the water nasty when it gets stirred up, and your fish are well fed, at decent times, and it's not too hot or cold for them, I feel that's pretty good fishkeeping.
If you throw them in a tank that's WAY too small. Say, a ten gallon tank, for a 20 gallon fish....don't feed them, don't clean up after them, don't care about temp, THEN you have a problem.......
Anyways, I'm off my soapbox now. Once again, not being *itchy, just speaking my mind!! ^_^