i have a 20g long SW tank,
in it i have 2 damsils.

They have lived in it for 1 year, and they died for some reason,
both at the same time. the water is fine,

what happened

Sorry to say, but with the info that you have provided. There is no way that I can answer your question, or anyone for that matter. You have to say what you have in the tank, your equipment, Ph,Amonia, Nitrite, and anything you have done that might be the reason. If you give us more info, I'm sure that we can answer your question.

AlexANelson is right,

you should tell us more about the tank. From what you told me, it could be an internal parisit, thats why you cant see it, or they got in a fight.

not to shure untill you give us some more detail

IceAge..................Where are you??????????

I agree with the statments above more info.

Welcome back phillyfish!

Thanks i'll be posting more.