Update 12-26
** It has been 6 days now and my clown fish still has not eaten. Every time I feed him he seems to react but not eat. Also my inverts have not moved an inch since i added them last week. I did a 50% water change and re checked my parameters. Everything is on point with my water parameters. The only thing i can think of is that i am using different salt than what we use here at the shop. (we use instant ocean and i am using Aqua Forest at home). My corals in my tank are super happy but my clown and inverts are not doing well. The clown has zero signs of parasite or fungus. I had a light and magnifying glass up to his mouth and everything looks fine. The mystery continues!
Did you try the foods @Gareth elliott suggested (reposted below)? Good advice there.
Try some frozen foods or live foods. Live Brineshrimp is a good appetite enhancer.
if wish to switch over to pellets later. Slowly add more pellets to your frozen slurry over a few weeks.
you can also try selcon(omega fatty acids) or entice(banana flavoring) to try to get more interested.
Small Frozen mysis soaked in a drop of garlic and/or live brine work for me to get a stressed fish eating; however, a sick fish needs medication. They usually don't eat until the underlying problem has been dealt with. I have to disagree with your source for information about freshwater dips. A freshwater dip WILL NOT kill all pathogens on a fish. To clarify, a freshwater dip is best used to provide relief for a fish suffering from flukes, lice, and/or other unknown pathogens lodged in the gills. In other words, it will confirm 'some' types of bugs feasting on a fish, but treatment is still needed to eradicate the nasties, and a second treatment is needed to get any hatching eggs. Keep us posted.