Fish dying

[Tyler777]

I recently cycled a 225 gallons tank, fishless cycled. At first everything was OK with the water but out of the blue after adding fish I added around 15 fish nbthen when I think I screwed up I bought n added 20 more fish.

Nitrites started showing up 0.25 ppm.

Can this amount of salt kill my fish ? I lost 11 fish in 3 days.

 

[MaloK]

No, .0.25 ppm nitrite in an aquarium is generally not considered that harmful to fish and wouldn't trigger a water change until 0.50 for me.

Stress, transport and water parameters discrepancies are more likely to be the culprit under 3 days.

 

[Tyler777]

No, .0.25 ppm nitrite in an aquarium is generally not considered that harmful to fish and wouldn't trigger a water change until 0.50 for me.

Stress, transport and water parameters discrepancies are more likely to be the culprit under 3 days.

Besides the 0.25 nitrites, I have zero ammonia, ph was 7.6 n nitrate was very low.

 

[MaloK]

What about GH and KH ? If you have large difference between your fish vendor and your water, that should be taken in consideration.

 

[Tyler777]

What about GH and KH ? If you have large difference between your fish vendor and your water, that should be taken in consideration.

I will have to check that

 

[Colin_T]

If you cycled the aquarium correctly there shouldn't be any nitrite. The whole purpose of doing a fish in cycle is so you can add all the fish at once and not have to worry about ammonia or nitrite problems.

Post pictures of the fish so we can check them for disease. If you have pictures of the dead fish post them too. And post a picture showing the entire aquarium so we can see if anything needs tweaking.

Did you do a big water change after you finished cycling the aquarium?
It's a good idea to do a huge (90%) water change after cycling and before you add fish. this dilutes anything that might be in the water and gives you a cycled tank with really clean water.