my hamster scratches all the time and I think he has red mites what I can do ? (Something cheap please?
And she if to agresive too
It is necessary to take her to the veterinarian to confirm that the cause are mites and according to the diagnose, the vet will prescribe a specific medication.
I recommend you to buy a new cage and new accessories, or to clean and disinfect the cage and the accessories that you have now very thorough. Then repeat the cleaning every week in case some mite remains and thus prevent it from reinfesting your hamster again.
All the best.