Sorry for your losses. Hope this is the end of your run of bad luck for this tank.
I second the TT method for Ich. If you are sure it is Ich, catch the fish and put them in a 5G bucket.
From your thread you have three dartfish, two clowns, a mandy and a Bangaii cardnal. Seems like that might be a crowd for a 5G bucket but you gotta do what...
I'm not sure Paraguard is a great med for Ich. Cupramine works but can be deadly for the fish. Chlorquine phosphate is also effective with the added plus of working on Velvet and Brook. Since you have a small child in the house, I'd just use TT.
From discussions on Reef Central, the recommended fallow time for the DT is 72 days! Since this is such a LONG time, perhaps you could find a temporary home for the fish after TT?
Good luck. Hope the remaining fish make it!