They Rainbows didn't have any visible marks, lesions, lumps, bumps, or anything. I did notice on the last two that died, they did have labored breathing 24 hours before they died... I assumed with the death of the first one that it was age... but then I lost a second, and by the third I ruled out age, that seems way too coincidental that all my Rainbows reached the age of passing at the same time, all within one week... Also, none of the other fish have showed any signs of stress, labored breathing, nothing. All are well, eating regularly, and acting normal. The first two Rainbows that died did not show any signs of illness or stress, they were just dead when I found them. The third one to pass did have some labored breathing, but still ate 24 hours before passing. The last two had labored breathing, and did not eat before passing. I am just so stunned by this loss... I hate when fish die, but it seems worse when there are no warning signs... I have lost fish in the past, but usually you can find an underlying cause... This one I can't.

Thank you for all your input, I really appreciate the help.

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