I hope you don't have all those meds in there at the same time. Wunder tonic contains a mixture of treatments that will work on most things but I would do a good water change to get rid of the stuff that is in there. If whitspot looks like the fish is sprinkled with salt then velvet looks like it is sprinkled with pepper. Not always easy to see but the easiest way is in the dark at night with a torch. If it doesn't look like it is sprinkled with pepper then you are dealing with something else. There is a type of velvet that we used to call encapsulated velvet. The velvet that you see on the fish is not what you can treat, it is the vegetative form that emerges from what you see. Sometimes they are reluctant to do this but can be encouraged by raisig the temperature. One of the ingredients of wunder tonic is quinine which will kill the vegetative form, however, so should furan and copper if used at the right dosage. If you use too much copper you will end up with a sterile corpse.