Fish Dying.. Please Help

[jv24]

Hi, i noticed yesterday my mollie was at a 45 degree angle in the water, with its tail down and head up.I couldn't see anything wrong with it. Today it died.
I have just noticed my platty sitting on the bottom of my tank. This doesn't look too healthy either. I did a water change yesterday and all water stats are normal. I have sand as a substrate and a planted aquarium.
All my other fish look fine at the moment. Anyone got any advice?

thanks

 

[Embrace]

Did you cycle the tank?
And you say your stats are 'Normal'.. What are the exact results?
Thanks
Elise

 

[jv24]

Hi tank is cycled, stats are PH 8, ammonia 0ppm, nitrates 40ppm and nitrites 0ppm. I know the nitrates and ph are pretty high, but this is what they have always been. The water test was done with an API liquid test kit.

 

[lilfishie]

any other symptoms? irregular breathing? marks/spots? is ther poo normal?

 

[jv24]

There seem to be no spots on the fish. The breathing seemed really slow, the waste seems normal. i am just going to do another water test for ammonnia. This was 0ppm yesterday, but will check again.

i have just carried out an ammonia test and the reading is 0ppm

 

[Lionfish lover]

There seem to be no spots on the fish. The breathing seemed really slow, the waste seems normal. i am just going to do another water test for ammonnia. This was 0ppm yesterday, but will check again.

i have just carried out an ammonia test and the reading is 0ppm

try looking for parasites in the fish's gills if their is then the fish has a bacterial disease that should be treated with Maracyn-Oxy. By itself in a isolation tank, so it has less stress from other fish hopes this helps