I would not recommend daily. After having an ick outbreak in my reef I was using garlic daily for a few weeks and definately noticed that it appearred to be causing an increase in the amount of algae that was growing in the tank. Particularly hair algae which went away once I stopped using it even though I was feeding the same amount, with the same frequency, and the same light bulbs. Reducingthe garlic definiately led to a reduction in algae.