I cant find your original post. What exactly is wrong with your fish? Does your local veteranarian deal with exotics (meaning fish)? An office visit might be expensive, but at least he/she will be able to _look_ at your fish and be of more help.
Paragon is made by Aquatronics (http://www.aquatronicsonline.com/). It is a broad spectrum (ie treats most everything) 6 component blend of anti parasitic, anti bacterial powder that clears up infestations of parasites, infections and secondary infections caused by parasites, poor water etc.
The only experience I've had with it is when my oranda, Godiva, got a nasty ulcer with what I believe was an anchor worm sticking out of it. Here's the thread:
http://kokosgoldfish.com/forum/index.php?s...=4017&hl=godivaI treated her with Paragon and followed the instructions *as well as the advice of the board members* and the ulcer (there's a picture- it was gross, and looked even worse the day before) was completely healed in 5 days. Then again, you should remember, Godiva was the only fish in a tub of 15g, with no gravel, decorations or toys, and her water was changed every other day and kept very clean.
As for the test kits- the _most_ important ones you NEED to have are for Amonia, Nitrite, Nitrate and pH. If you are using Amquel plus as a conditioner, I can tell you right now that the test kits made by Aquarium Pharmaceuticals (aka Doc Wellfish) are compatable and should give you accurate readings.
Otherwise you have to be careful. Sometimes Amonia, Nitrite, and Nitrate conditioners/removers will give you false positive readings (ie it'll tell you that your Amonia level is sky high, when really it isnt). So ask before you buy and always read the label.
I'm glad you've found my rambling helpful. So many others have helped me- I'm just happy to give something back to the GF Community and share what I've learned. You and your little fish are in my thoughts and prayers. Keep trying, but if it looks like (s)he's not gonna get better, there's nothing more noble than helping him/her to stop suffering. Take care and let us know how you're doing.