i put the frozen brine shrimp in my tank and my piranhas looked at it like they were lost it made the biggest mess in the tank i thought it would stay stuck together like the beefheart but i was wrong so i gave it back to the store. use to eat food that floated but now it seems like it has to sink for them to eat and they eat it before it even hits the bottom what do u guys recommend for food that sinks i bought shrimp from the local seafood store they love it but i was just wondering what else is good that sinks thanks