I have zero algae on my front glass. I use a shade for the majority of my lights and a kessil up front pointing to the rear, to keep the light off the glass and use black sand so it doesn't reflect onto it. You can leave it for weeks before you have to rub off the biofilm. I clean the fingerprints off it more than algae. I used this technique on another tank, using a spotlight kessil type light and black sand with no shade so there was some tiny spill light and it was about a week between cleaning the algae.