I mix my own special cube. its funny because, i had a fish with ick a looong time ago, so i stared reading the nutritional facts of a lot of frozen foods. I came up with a bomb for fish's inmune system, that fisyh cleared up in no time,he's one of my hippos, its worked so far, not a single sick fish in over a year, they are fat and happy and i believe its because of the food i give them.