How long till a fish's body dissappears

[Dresden]

reason i wonder, is last time i saw my Clarkii Clownfish was 2 days ago. I came home from work yesterday and couldn't find my clarkii, maybe my lunare wrasse had struck it. Now could have happened in the evening previous night cause I wasn't looking for it in the morning before work. But fruitless searching has resulting in no body or corpse. I miss my clarkii. =(