Is it dropsy? Or something else?...Help please

Help! Were losing fish at least 2-3 a day. All water tests come back fine. Tank is mature and stocked with community fish such as guppies, gouramies, swordtails, neons. No particular type is dying but mostly the guppies at the moment. They can be fine one minute, dead the next. I have completely lost a large pregnant guppy, cleaned tank, no sign at all, but others are just dying. Or bizarrely just 'lie-ing' at the top by the filter. Its very frustrating. Any Ideas please? I have spent a fortune on 'remedies' to no avail.

 

What are your actual readings for ammonia, nitrIte, and nitrAte?

How big is the tank and how many of what fish are in it?

How long has it been set up?

-Chelle

 

Hi techno chicks, Also need to know what meds you have used in the tank. When were each of the meds put in the tank? Were there any water changes between medications, and how long have the meds been in the tank. Combinations of some medications can become toxic to the fish. Also many medications if left in the tank too long can become toxic.