Surprised the neons are doing well as they are not hardy fish at all.
They need matured tank of six months.
Just water changes daily and increase aeration.
Do you have any friends who keep fish that have a mature filter sponges they could give you.
Whats your location.
Try here worth a shot.
http
/www.fishforums.net/index.php?showtopic=150631
They need matured tank of six months.
Just water changes daily and increase aeration.
Do you have any friends who keep fish that have a mature filter sponges they could give you.
Whats your location.
Try here worth a shot.
http
/www.fishforums.net/index.php?showtopic=150631