There are many basic recipes available for creating your own foods for your fish and invertebrates, even the filter-feeding ones. Some are more practical than others. In general, a good recipe should provide a well-rounded diet for various life-forms in the aquarium. Most filter-feeding invertebrates are omnivorous (they require both meat and plant-matter to survive) as are many fishes. Here is a good example for a fish/invertebrate ration. Feel free to modify it as you see fit.
Finely Chop shrimp, shellfish and spinach (or seaweed). Thoroughly mix in thawed Artemia and liquid vitamin. Either utilize small ice-cube tray to re-freeze or freeze in small, flat blocks that can be shaved with a cheese grater or broken into smaller pieces for feeding time. A good idea I came up with is to use egg crate (left over from my plenum DIY project)
For invertebrates, use a blender to puree ingredients. Feed about 1 tsp per 100 gallons of aquarium water depending on bio-load of system 2 - 3 times a week. (one cube from small egg crate is about 1 tsp
This particular ration is one that I am recently experimenting with.
The directions for this recipe are the same fore the one above. It might be a good idea to pre-chop dry sea-weed because it doesn't chop well with other ingredients.