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originally posted by: 5ofineed5aladder
Could it be trying to float but is stuck under a structure where you can't see it? Or maybe it's playing real good hide n seek.
originally posted by: ketsuko
Hard to say without more specifics like what your stocking is.
Sometimes, fish will eat each other. Any fish that can fit another one inside its mouth will try, even the so-called peaceful community fish are not above making a meal out of something appropriately small.
There are other reasons for a disappearance too, but without knowing what you have, etc., it's hard to say if that's possible.