How Am I Gonna Do This?

[Enigma]

I'm having a hard time developing my plan of attack, and I could really use some advice.

So, I have three fish (Green Chromis) which definitely have worms. I have one Clown that I suspect has Brook (I've lost two already, with symptoms that lead me to suspect Brook): though he isn't displaying any symptoms of it. I have one fish (Signal Goby) that I suspect has internal parasites of some sort: just because I've read that "all" Signal Gobies do.

Nothing is in dire shape. In fact, everything but my smallest Chromis (who is picked on by the Clown and the other two Chromis) look very, very good.

I have purchased Ich-X and PraziPro. The manufacturer's website indicates that they may be used together (despite the warnings on the bottles that indicates neither should be used in conjunction with other medications).

http://uskoi.com/prazipro.htm
http://uskoi.com/ich-x.htm

I am purchasing a used 33 gallon tank. It comes with a Fluval 305 external filter. I have no idea what to do with the filter. I want to use it on the QT/Hospital tank, but I'm not sure what media to put in it for the duration of the treatments.

Also, I think the 33 gallon tank may be a bit big for the Ich-X treatments. I'm going to go through a lot of salt and water, as I'm going to have to change 33% every 24 hours before the daily treatments. I have no idea how long I'm going to have to continue the Ich-X treatment for.

I'm planning on treating all of the fish together, as I figure they've all been exposed to what each is carrying.

Along with PVC pipes, I'm planning on putting a glass casserole dish containing sand in the tank to inject the Goby's food into (this is how he is fed in the display tank).

Should I use a smaller tank? Can I use treated tap water to make the saltwater? Should I use both meds at the same time? How should I set up the Fluval 305? How long should I leave the fish out of the display tank to ensure there are no parasites left in it when I put them back in? I have no idea what I'm doing.

Calgon, take me away!