Dying Blood Tetras

[Munkys Mummy]

I posted a couple of days ago about one of the blood tetras which had a swollen abdomen, we ruled out dropsy, well this morning it was dead which I expected as its breathing was rapid last night. This morning the other fish were fine, well in the last couple of hours I have found 2 more dead tetras, one of which appeared to have a swollen abdomen also but not he other. I have tested the water and the readings are

Nitrate 0
Nitrite 0
PH 6.0
KH 0
GH 60

All the other fish seem fine but then again so did the other 2 this morning. I am confused but thats not hard, I am not an experienced fish keeper but do stick to the rules as far as possible on good advice

 

[*Fishkies*]

Do you have an ammonia reading?
How often did you feed?

Anything newly added to the tank?
Any chemicals added to the tank? Such as medications or algae destroyer?

 

[Lynda B]

If you have a cycled tank, you should have a nitrate reading. As fishkies asked, what's your ammonia reading?

How long has the tank been up and running and what are the other inhabitants?