Welcome to Fishlore! Have you tested your water (or had it done at the pet store) so you know what your
ammonia,
nitrite, and
nitrate numbers are? If so did you finish your cycle before adding fish, or did you add fish right away? Are you treating your water with anything (NovAqua, AquaSafe, Amquel+, Prime, etc.)? Have you done any water changes lately? How big is your tank? Just a few of the questions we'll need answered to have a chance at understanding what is going on with your fish. The most important though are the current ammonia, nitrite, and nitrate levels. If you don't have a
test kit (it's highly recommended that you have one (
this is a good one)) then take a bottle of your water to a pet store that will test it for you and let us know what they are.