my fish stays at the top of the aquarium

i got my fish as a present and now i donno how to feed them or how often should i change their water
and lately , thy r staying at the top , i dont use an air bubble blower machine ( i donno its exact name) so anybody plz help me....
thankx

 

Welcome to FishLore! It's great to have you with us! Usually when fish gasp at the top of the tank, they are not getting enough air. That's why we need to know a little more about your tank. You may have high ammonia or nitrite, or there's just not enough air water exchange, which can easily be fixed with an air stone. If your tank has too many fish in it, that's another problem, but we need to know more about your tank and what's in it.

 

first, thnkx all 4 ur replys
its really ment a lot 2 me, as i nvr thought that anybody would care
really really thnkx,
then,
my tank is a small one, the traditional small ( ball shapped ) tank
with 3 small fish in it...each one is about 1.5 cm long...
i feed them twice a day, and i change the water every 4 to 6 days..
wht is the ( air stone ) i donno it.
but i askd sm people thy told me that i dont need that air blower as it is a small tank..
and ill tell u more as soon as i know more about my lovely fish
sorry 4 my poor english language, but im trying 2 do my best,
as my mother tongue is Arabic as im from Cairo ( Egypt)

 

Please take a sample of your water to your local fish store, and have them check the ammonia and nitrites. If you can get test kits for ammonia, nitrite, and nitrates, that would help out a lot in the long run. How much water do you change out every week? And when you change the water, do you dechlorinate, or do you have water that doesn't need to be treated?

 

my tank is a small one, so i change the water once a week besides, i take a cup of water from the tank and put another fresh one everyday.
every week after i clean the tank and fill it with water i dechlorinate it.