My rb babies are 3/4-1 1/2 inches long. How big of pieces of food can they handle? Can I throw in a big piece and let them tear into it or do I need to chop it up? It seems that I could keep the water cleaner by using big pieces and then just taking out what they don't eat if indeed they can handle the bigger pieces of shrimp, beef heart etc. Is raw shrimp better than the salad shrimp that is always cooked when you buy it? How big of a piece should I give 3-4 rb p this size?