No one I know has heard of it and I havent seen it at any of our LFS
either. I would suggest a varied diet depending on what ever fish you have in your tank. Rotate a few high quality foods to make sure they get lots of variety and nutrition.
Depending on what tank mates you have, I know you can also make your own seafood mush with all kids of stuff blended up and then freeze it in little itty bitty icecubes... I think the recipe is on here somewhere, but it might have been for meaty meat eaters.