I use it in my 25 gallon mixed reef tank to feed my fish and to target feed my button polyps. Fish that feed on copepods in the wild will love it! Only a little bit is needed per feeding so it will last a little while.
Just mix it in some water before to pour it in the tank if you don’t want the food to go down your overflow. It spoils fast so it needs to be refrigerated or freezed in small portions after opening.
Definitely recommended, either for direct addition, or as an ingredient in a homemade fish food.