05-06-2014, 02:29 AM
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There are some other things that can work that quickly. Some cancers can suddenly spread and blow up important bits like arteries and organs. Not so common, but it happens.
Toxins and chemicals...something that fell into the tank, any airborne chemical like fabreeze, deodorants, cologne can sometimes hit in a bad way if one were to swallow air while eating(more common with labyrinth fish, but it can hurt others if the chemical is in the air at the time of feeding if they decide to get what didn't sink or something). My mother sprayed fabreeze all over the house once when she came to clean for grandma, she did not say anything, killed three of my cories and one of my betta, as well as a swordtail(all had the symptoms of getting hit by the airborne chemicals, spinning on the bottom and then dying soon after) even though she sprayed outside my room. I was so miffed. =( My neon blue gourami also had the symptoms, but he survived it, he wasn't as bad. The rest of my fish seemed unaffected. They get air up top during this time without being covered or having ventilation in the room and boom, they will have trouble swimming, some will spin while they try to swim on the bottom, and typically die within hours.