I may be wrong or it maybe what oscars do but my oscar one day hes fine the next day he is laying on his side at the bottom of my tank he also has white spots on him that he never had before his eyes also have this cloudy look to them they also look like his eyes are peeling like a snake what should i do is he sick do i need to change my water i ask the people who work with them at the pet store and they told me to get him a heater so i did but he is still doing it i dont want my oscar to pass can anyone give me addvice please.

Hi and welcome.
Judging from your story it sounds like a case of bad waterquality.
We need you to test your water asap.
We need Ammonia -Nitrites-nitrates and Ph readings to help pinpoint the problem.
If you don't have a testkit get a liquid one.
I'd suggest to do a 25% WC daily until you can test your water.
How many Gallons is your tank and how long has it been running?
How big is your filterand how long has that been running?

I moved this post to a more appropriate spot. for fast assistance and best advice check to see you have posted under the best heading in appropriate room. X2 with Noddy. you need to give us the answers to the questions he has ask. In the mean time do a 25% water change daily.

You fish mite have white spot disease

Your oscar has problems, can you post a pic so we can see what is wrong. But in the meantime do daily 30% water changes. Test the water. If the spots are pin prick white then raise the tank temerature up to 30c, dont put any meds in until we can see whats wrong in case you put the wrong one in (some meds dont mix with others)