Of course! There is no problem with adding Alg·A·Mic to the nutrient mix to water a plant where All·Mix is the substrate. The extra amount of algae will be absorbed by the roots when the plant considers it necessary.
However, it is not necessary to use Alg·A·Mic in all irrigations, since All·Mix is a very complete substrate.
In addition, Alg·A·Mic is perfect to be used as a foliar spray, which allows the plant to enjoy all its benefits without interacting at any time with the substrate.