If the cloudiness is caused by a bacteria bloom or algae bloom then yes a UV sterilizer (connected to one of your canister filters) will clear it up pretty quickly. This appears to be what is happening.
Cloudiness caused by suspended particles will not be affected by a UV sterilizer. But this does not appear to be what is causing the cloudiness based on your description of the setup and maintenance.
Andy
Cloudiness caused by suspended particles will not be affected by a UV sterilizer. But this does not appear to be what is causing the cloudiness based on your description of the setup and maintenance.
Andy