How to keep fishes alive?

[rodmarine]

Hi, I have been keeping marine fihes for almost 2 years. All my fishes are going very healthy and active. But recently, i introduced about 4 fishes into my tank but the result was not very pleasant. All of them died. Can anyone tell me wahat happening? This is not the first time already....

[pegasus1010]

the 4 fishes from same shop?

[XPeriment 626]

hard to tell without more details...

how big your tank? what 4 fishes? size of the fishes? current tank inhabitants? etc.

you could have overstocked too quickly and the toxins built up quicker than your tank can handle...

[wayne]

Mmm....i feel tat most of the shop did not quarantine the fishes in a correct way tat y fishes are more sensitive nowadays...

[RAV-65]

The existing inhabitants of the tank could have been real aggressive to the new fishes and stressed them to death....