fish die

I have 250 lit salt water tank, last two days die all fishes maintaining salainatry 32 and every thing was normal any thing to be checked.(nitritr 0)

 

How old is the tank? How long have you had the fish?

What are your ammonia levels?

Do you have good surface agitation to get gas exchange?

 

surface Agition how we do it .possible advise me may Ammonia level high if how to reduce it . i arrange 2 power filter one Protine skimmer and tow air supply stone. is right or

 

Surface agitation is to make sure you have oxygen in the water. If you have air stones and a protein skimmer, then you should have enough oxygen.

I would test for ammonia.

 

Did you change anything different or add anything different to the tank. Did your temp or ph change at all ? Can you please tell us a little bit more about the tank/system. Sorry to about the fishes.

 

i think Protine skimmer is provided enough Oxygen in the tank. now i removed extra air hose pipe, to see what hapend in the Tank.
thank for Advise