You might want to look into softer, less noxious algaes such as Lettuce Algae. One thing that I've always wanted to do was to attempt to make my own nori. Just grow a hole bunch of different algaes, harvest them, toss them in a blender with various vitamin supplements like Selcon, and the put them in a dehydrator to make sheets of them.
Sonya's already said it was okay for me to dry out some blended meaty food to attempt to make a flake food like item. But I don't know how well dehydrated shrimp, fish, octopus, squid, scallops, etc would smell like. I don't think I want to risk my house smelling like that for a couple days (or linger for more).