In my opinion it would be better to do smaller water changes of 5 to 10% more frequently. Garlic is not a treatment but rather may be an appetite stimulator and provide some boost to the immune system, there really is no scientific proof of either benefit just anecdotal evidence, but it sure can not hurt. Your best defense is read the links, know the parasites life cycle and proceed with only those scientifically proven treatments. There are no ReefSafe products you can buy that are effective, and no easy cure.