Well, there are about seven stomachs for you to check...
Which fish is missing?
Frodo ate my fish Wanda. I was thinking of renaming him Otto. I was looking and looking for an angelfish that I had in Boston. She disappeared. No trace. Then one day, I'm fishing out a dead guppy and Frodo races to my feet, sits politely and licks his chops. Mmmm, dead fish smell. Frodo ate Wanda after she leapt from the tank... there is no other explaination.
:D

A fish called Wanda. Oh, the irony.

i bought 4 new cardinal tetras on wednesday. on thursday, there were 3. today there are only 2. my original tetra is sill there. no trace of them at all.

Maybe your first tetra became a canibal. Otherwise I suspect the cats also as others have said. Of course we had a fish who would jump out of the tank, so you just never know.

well, if we have selfish and suicidal fish, then they deserve to be cat food. I just don't want them poisoning my tank with their carcass.

I think someone (Calliope) is eating your fish. If the fish were eating each other, there would be fish remains all over the place. I think a cat (Calliope) is taking them out of the water by the filter at the back of your (Lisa's) tank.

:D

i lost the beta today and all of the tetras are missing.

Maybe they learned how to teleport.

i've recovered 2 bodies. it's like WWI over here.

Oy.
Have you been doing water changes?
It sounds like an ammonia spike...