I had my water tested at the fish store
What were the specific reading?
One white spot is not indicative of ich. Ich is not know for being a fast killer, but a few other ailments are. Are there any other symptoms? When you say the clown is acting weird, what is he doing? Any other physical marks? Are the fish eating? Do you notice any of the fish flashing (scratching)? The Tangs eye injury may be caused by this. Can you get us a pic of any of the effected fish?
they sold me this stuff called Kick Ich?
, junk. There is no treatment that you can do within the main that is all that effective. The way to go is to move all the fish (not inverts) to a qt
tank for treatment with a good med such as cupramine and leave the main tank fishless for 6 weeks to allow the parasite to die off.