Marine Invertebrates are the most diverse and curious creatures on earth. They are thought to comprise up to 95% of all the known species on earth. They come in many shapes, sizes, and colors. Most invertebrates are easy to care for because they are simple creatures that are lower on the food chain. They will scavenge or rely on photosynthesis for most of their nutrition. This is good for an aquarium since they eat uneaten food or waste from your other inhabitants.