Jerry.I am fully aware of how meticulous you are about feeding your animals.(you have some beautiful stuff)I have no doubt that there are Mandarins who will accept prepared foods. My main concern with that is they must have an extremely fast metabolism in order to eat like they do.(all day long) Using prepared foods as a supplement is one thing,using it as the only means of sustenance is quite another.This is especially true when there are other fish present in the tank that consume the food more aggresively.I really hope that this Nutramar is the answer but I am still skeptical that it will be feasible for your average aquarist.As far as ORA knowing what they are doing. How could they possibly know in this case.Unless a long term study was done including doing necropsy's on these fish. For all they know Nutramar could be the equivalent nutritionally for them as cheeseburgers are for us.Sure they will keep you alive for a time but then one day you reach up and clutch your chest and drop dead from a heart attack.We used to feed all our groupers goldfish. When one suddenly died I had a friend do a necropsy on him and his heart was covered in fat. We now know that this was from the goldfish and it isn't done any more.I guess what it all boils down to is changing a fishes dietary needs is dangerous.Sorry for the long post.