better question are you honest?
What if he is not honest but is honest about it and says NO, does he get to borrow the uv sterilizer? LOL.

Actually a sterilizer won't do much for bacterial infections. Bacterial infections are almost always the result of stress and/or poor water quality, same as in SW. I would suggest you do a 40 -50% water change and then treat with a broad spectrum antibiotic, something like Furan-2 or Tank Buddies Fungus Clear. They'll turn your water yellow but that is easily removed with carbon after the treatment is finished.