I make different blends, I order fresh seafood, (chef here, fish eat well). Typical mixes: Oysters Clams Shrimp Scallops White fish Oyster eggs Mussels Lobster Crab Any fresh / live fish from the market, like eel, snapper etc.. (Use the organs) I make different blends depending on my menus at work. Freezer in double freezer bags, flat. I do add selcon or something similar when I thaw daily, but I don't rinse off. We do eat a lot of fish at home, so I sometimes cut pieces and drop in tank. They love it!