Use mini for small aquariums and fish bowls.
Use Regular for mid-sized aqauriums.
Mini: 1" cylinder diameter | 6" cylinder height | 3/8" tube diameter.
Regular: 2" cylinder diameter | 10" cylinder height | 1/2" tube diameter.
It’s easy to control, decently sized, and perfect for small set up’s. Picks everything up, the vacuum connects snuggly to the hose making for no leaks or weak pressure, and has very good use