Disappearing fish.

[GMGQ]

I've lost a few fish, and I've Never seen a dead body. I know I had a huge crab in the back of my tank before (body was the size of an egg, round like an egg too). Around where he hides is a graveyard of snail/conch shells too.

Thankfully I think he kicked the bucket now too, as I've put more snails in the system, and they're all accounted for.

If you can find it, catch the crab and put it in your sump!