If you are going to use beef heart special care needs to be taken in preparing it. You can have the meat dept slice alot of the fat off, and cut it in slices...I did this, then when you get it home, wash it very well and cut it into small chunks, put small amounts in baggies tying them off and then freeze them. Then when you want to feed with it you can take one baggie out to defrost IN the fridge or rinse with cool water to thaw. Be sure to keep what is left refridgerated immediately after feeding. Ive never had 'fronts' but have kept carnivore fish and did use beef heart, worms, and small frogs plus live feeders.