Wednesday night I found the new fancy guppie male that I bought last week dead in the tank with my teachers two guppies & four mosquito fish (I'm watching them over the summer). It looked like Dominik just died for no reason.
Shortly after removing him I noticed that my teacher's female and male guppie were acting weird. She was swimming nose down and he was lying at the bottom of the tank & had a hard time staying up right.
I put the two guppies into isolation & they both died that night. =[
All of the mosquito fish are happy and healthy swimming around like nothing is the bother.
The symptoms of the two that I saw while they were sick/alive seemed like they got Swim Bladder Disorder. But that isn't contagious so how come all of the guppies died & the mosquitos are still okay?