Well the
garlic pills are the gel ones 1500MG or you can get the oderless ones that are 500MG.
The other question with inreguards to catching the fish. U can always catch a fish no matter how bad you want him.
With dropping the ick off the tank you wil always have ick in your tank when yo have Tangs or Angels, IMO. It usally takes around 3-4 weeks with the lights off to kill off the spores in the tank. If you have corals well that is going to be a big problem too..
good luck and keep us informed