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I've had that happen several times and I'm convinced that it was the extremely large population of snails that I had. I've heard they can make pretty short work of a body, especially if it died in an area you don't see easily. The discus seem awfully large to disappear so quickly though. I'm thinking my cories may have been responsible for some scavenging too but, I was never really sure. Hope you find the culprit!