Hi there! So I was able to watch most of your video and here's a couple issues I see....
1. You don't want to treat your fish in your sump. Unless you plan to use Hypo for treatment for this tank, then any other treatment options like copper and CP will leave your sump in a not-so-great condition to be used on your display again.
2. You don't want your display and your QT to be so close together. There is something called aerosol transmission which means that ick and velvet can be carried about 10 feet through the air by turbulent water.
3. A sepperate area all together and tank will be ideal for treating your fish. If your absolutely sure that you have ick, then I'd suggest using TTM (Tank Transfer Method) to treat them. This takes 12 days to complete and uses no chemicals like copper. It also works. Your little dragonet will not be able to tollerate copper and Hypo is very difficult to execute properly (not to mention the several strains of ick that have been proven to not respond to Hypo)
4. Not really an issue, I just didn't see it mentioned... but be sure that you are leaving your display fallow for 76 days to starve out the parasite completely from the tank.
This link will give you all the info on TTM
Tank Transfer Method If you have any questions after reading that, please be sure to ask them here.