Many believe that the death rate among Moorish Idols is because of malnutrition. Some say that there may be a certain type of sponge that they eat that we haven't been giving them, although it is uncertain. Maybe it would be nice if we could get some type of wildlife foundation to explore this. If the cause is due to lack of nutrition, we should investigate what it is they are missing in their diet. You never know, someday we may be able to easily keep Moorish Idols and not have them dying so quickly. Since the purchase of this fish is not likely to stop, we should look into reaserch of this fish so that people can keep them in captivity without such short lifespans.