neon tetra behavior

I have a year-old, and some months, tank, its fully cycled as of 2023 of December 2nd. The only known problem I'm battling right now is an outbreak of Cyanobacteria (I've been hand removing and doing water changes at least once a week). I've recently removed several handfuls of java fern as it...

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...

Hello everyone, I'm a new aquarist. I don't have the readings of my water on hand, but my local aquarium shopkeeper told me everything is in tip top shape after taking a reading before I started adding fish. Two days ago I purchased 6 Neon Tetras and 1 Sewellia Lineolata. My question is in...