I'm scratching my head is disbelief as my tank dies off. I have a 55 gallon tank established over a year. I've lost 3 fish in two weeks. The strange part is they show no obvious sign of illness. One by one they float next to the heater for a few days then die.
The only sign something is wrong is they breathe heavy and stop eating. So, with that information the first step, check ammonia. But my levels are fine so I'm back at step one. I thought maybe low O2 but then all the fish would be gasping at the top of the tank.
Now, I had a Serpae Tetra die last month in a hospital tank of what seemed like NTD. He turned Gray and resembled something out of a Stephen King movie. It's certainly possible that my tank can be contaminated with whatever killed the Serpae, but then, wouldn't these fish die the same way? There not, their eyes are clear, no obvious cause, they look healthy even in death.
Eheim 2213 filter with spray bar.
- Change filter floss when needed
- Clean ceramic rings when needed
- Change 1/4 of substrate every 3 months (Bio)
Ammonia - 0
NitrIte - 0
Nitrate - 20
PH - 7.6
PH Tap - 7.6
KH - 7
DH - 4
25% change every week
Vacuum with every change
No other chems
6 Black Mollies (All female)
3 Platy (All female)
4 Serpae Tetra
None used since no cause.
I would be gratefulll with any insight some may offer. This has been a sad and confusing few weeks.