What bacteria attack and digest bacteria?

yes

There are no bacteria on other bacteria. Some bacteria do attack other bacteria by piercing their cell wall and injecting proteins. Viruses can attack bacteria. They are called bacteriophages.

it kills aerobic and anaerobic gram-positive and some gram-negative bacteria, its a broad spectrum antibiotic.

The bacteria want to live like any other organism but our bodies contain a lot of compound which is may be nutrients for bacteria (((Moustafa Sharamant)))

bacteriophage