It's odd, I had a 55 gallon with 4 RB about 3-4", I sold that to my Roomate and Bought a tank from Activepule(P-fury member). Now my old piranahs loved shrimp so it was easy. These new piranahs I bought are bout 6" each and there are 6 of them. I tried a feeder the first day and no dice. No dice on the beefheart. That was 2 days ago. Each day I put a little beefheart in (Good chunk) and maybe one will nibble but not much else. It got feeders ready to go, but should I go with them or Shrimp. I really dunno. The RB I moved to my roomates room are working out fine and eating shrimp a-ok. Activepulse told me his P's like the Beefheart and such. BUT NO DICE ON THE BEEFHEART. Am I giving them too much. I could use some help here these are AMAZING and I want to see them go nuts, but they seem Intent on fighting with each other.