we use it quite often. Smells to high heaven, but its something we started a long time ago. Some say it stimulates appatite and some say it helps with certain diseases. We let it soak with the food with some tank water for awhile and the strain it.
I use it daily. The garlic really attracts the fish to the food, and it's helped get fish eating prepared food that weren't eating when I first added them.
garlic got my blue hippo tang to eat green sea weed, he wouldn't eat it before it! so i love the garlic, unfourtunatly it fell from teh desk it was on, a stinky mess!