What is wrong with my fish, I have had multiple die like this.

One of my mystery snails hasn't moved in ~36 hours? More info

What’s wrong with my fish? He hasn’t eaten or moved much

!!!Warning : sick fish video!!!please help.the details in the

*EMERGENCY* does anybody know whats wrong with my gerbil? More

Is this detritus worms or something else? More info on comments.

Help!! What’s wrong with my betta & how can I help him?!

PETCO FISH. RED EYES AND FIN SPLITTING and I need all the experts

What’s wrong with my dad’s fish :(

Trigger: sick fish. Anyone have any ideas how I can help this

What's wrong with my gourami? (Sick fish warning)

What’s wrong with my knife fish , he’s swiming weird