Ok guys... slow down just for a bit... IF it is Black Ich, rasing the SG from 1.022 to 1.024 has NOTHING to do with the illness. To tell you the truth a drop in SG would be better to combat the worms (but not good for the tank as a whole).
Second, Lets get one thing straight, black ich is not related to "white spot" or Ich in any way shape or form. So do not get confused ilovesam. Garlic has yet to be proven for white ich but that is another debate, it will not do anything for black ich. So before you start making your tank smell like garlic pork, save your energy.
Third, yes a good course of treatment would be to QT the fish and to do a dip in formalin. Start your reading http://www.wetwebmedia.com/blkichcuref.htm">here</a> for other ideas. There are treatments that CAN be done in tank if the problem persists but I would only recommend them as a last resort.
Last, make sure you know what you got BEFORE just dumping stuff into your tank. You might want to start reading [IMG]http://www.wetwebmedia.com/paravortexfaqs.htm">here.</a>
I know you feel like you HAVE to do SOMETHING now, but believe me, sometimes collecting your thoughts and learning a bit will save your fish in the end.