I agree check your test kit first. I am pretty sure your fish would be dead or near dead if it was that high, and their behavior would be different. If you are testing with strips get rid of them and get a glass test tube test kit. API has great test kits. If it is still that high do at least 75% water change and dose 5x prime. Then repeat the next day with a 50% water change this should get things back on track. After that test the ammonia and nitrate daily. What is your Nitrate level?