something destroyed my whole tank, please help

[hqgc]

over the last 2 weeks something has wiped out my fowlr tank. I have lost all my fish with the exception of my bluelined trigger who is not looking very well. The blueline is currently sticking its mouth out of the water, almost like its gasping for air.
Symptoms include
-cloudy eyes
-extreme discolouring and patchy "paleness"
-fin rot
I have tried melafix to no avail, and am now at a loss. All my parameters are good.
I need to make this better but have no idea where to begin.
Any help would be greatly appreciated.
thanks

[Starry]

whats your ammonia at?

[The Grizz]

sounds like velvet to me, same thing happened to me lost all but 2 out of 10 fish.

[Delphinus]

I've suggested to you two times to confirm flukes, have you done this yet? You have described three classic symptoms of flukes. I will bet any money that this is the problem. Get some Prazipro and treat your tank, but it may be too late now by the sounds of it. I'm sorry.

Its iether flukes or velvet treat your last fish with fresh water bath and the isolate prazi-pro works very well for flukes but there are other treatments that work. sorry to hear that you have lost every thing you should have listened.

Bill

[kien]

ya, sounds like flukes. If you decide to give the trigger a fresh water bath keep a close eye on him. Make sure he keeps breathing and if there are signs of major distress stop the bath. A bath of 4-5 minutes should get rid of most if not all the flukes currently on him. You'll want to still treat the tank with prazipro though to get rid of any flukes in the tank and larvae. A word of caution, prazipro says to turn off your skimmer, don't do that! Keep the skimmer on and let it overflow into your sump (assuming you are using a skimmer).

[hqgc]

I will try treating for flukes tonight with prazipro. I will update after work today.
thanks everyone.