ADVICE NEEDED ASAP!

[sarah_key]

hi everyone...could really do with some advice asap! i have a tropical set up and i added a couple of fish on sunday and since then all they seem to be doing is swimming at the surface of the water....never done this before so am a bit anxious. i have also foind 2 fish dead 2nite... the only thing that has been put in the tannk are the fish, some new gravel,(which i boiled) and plecko flake. any advice please? thanks

[Carylnz]

Need way more information.
How long has the tank been running?
What size is it (dimensions please not just volume)?
What species and how many were in it?
What species and how many did you add?
What are the readings for ammonia, nitrite and nitrate?
What sort of filtration is being used?
I suspect a newly set up tank with poor water quality. Do an immediate 30 - 40% water change.