Generally you need a tremendous amount of UV to kill ick. It is extremely unlikely that a 15w UV unit would be powerful enough to kill ich, at any reasonable water flow rate. Most likely your fish got better because of improved conditions. In oher words, a lot less fish.
Personal I feel that products like Marind-Fish Vital are a complet waste of money, but they are not going to hurt anything. It should be pointed out that Marc Weiss has refused, many times, to disclose any real informations about any of their products. Because of this, many people consider all their products are questionable.
Ozone has it's own set of problems. Like UV, it takes a lot of ozone to kill ick. Ozone is tricky to use. because it's extremely dangerous if free in the air. Ozone should always be used with a skimmer, and the water and air comming from the skimmer must be passed through carbon. Most likely you didn't do that correctly, and thus the headaches.
Having used both UV and ozone in the past, I can say that both have their place, but neither is very good at disease control, when used at typical recommended levels.
On brine shrimp. Live brine shrimp isn't necessarily bad. It depends on the source. However, brine shrimp, live or frozen, is considered a poor food today. It's ok to get a new fish to feed, or as a treat, but for long term success there are many better foods.
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