What kind of a disease when your fish is always trying to scrape their body anywhere like gravel, sand, driftwood, or other decorations and how to treat it??
Could also be fish lice(argulus) or flukes.
Do you feed your fish feeder fish? they can bring in the parasites above. Have you added new fish from the wild?
Are your fish covered in small whitish dots? that would be ich.
Try to get someone with experience to observe them or take a few pics and post them before you attempt a random treatment.