[Myka]

Is this an established tank or a new tank?

If it is new then the cycle is not over yet. If it is established then you need to double check the accuracy of the ammonia kit by testing with a different kit. If the tank does have ammonia at 0.25 ppm that is quite significant, and could permanently damage your fish's gills. You need to add an ammonia detoxifier (like AmQuel or Prime), and then find out the cause of the ammonia.