The reason there is a small level of ammonia according to the test is
that the two guppies were recently added to the community.
In the normal course of running any aquarium this can cause small,
temporary fluctuations in NH / N02 level. This is due to a lag in
the colonisation rates of...
Those levels are extreemly low. 0.3ppm of ammonia shouldn't harm something like a zebra dannio, or much else in a tropical tank for that matter, same goes for the nitrite. Ideally they would be zero, I admit it. Those dannios can survive fine in water in excess of 6ppm ammonia. They are...
Sudden Multiple fish death - HELP
30 litre tank
NH3/4: 0.3 mg/l
NO2 : 0.1 mg/l
NO3 : 1 mg/l
PO4 : 2 mg/l
pH : 6.8
deg C: 25
deg F 78
Stocking:The tank is stocked with 7, 3cm fish and 3 snails.
2inch sand bed
I have Danio's a minnow, and 3 guppies and two tiny fry...