popeye

I had 7 neon Tetras for about a month. About a week ago one passed very suddenly. He was fine till an hour before and his only issue was swimming weird. Now another is sick and I can’t figure out what it is. It’s only swimming strange and it’s eyes seem bigger then the others, so maybe popeye...

I've recently upgraded my cories from a 15 gallon to a 40 breeder. I've also added some new cories to beef up the groups, and some congo tetras (who were unhappy being moved from their other tank, but it was getting a little crowded.) All of the sudden, I'm noticing all of my cories (I've got...