[Brucey]

Dane .... this really sucks mate and is a very sad tale. I'm guessing, but i think it is something connected to your tank that is giving you the problems. I'm not convinced by the theory that it could be cyanide or your LFS .... Just seems to much of a long shot.

I'm assuming all your params when you read them are fine. The most obvious answer i can think of is that it is connected to your params though. Fish have their own complicated set of defense systems in place to deal with bacteria etc which normally works very well. However, certain tanks effects can lead to stress of the fish and the eventual breakdown of these defence machanism's allowing bacterial infections etc to kill them off. I used to lose fish like you are in the early days of my tank (The first 6 months), but now I have not lost a single fish in over a year (Apart from a carpet surfer and two clowns that went over the weir). The main reason for this is a better understanding of what is going on in the tank and spending money. Your levels look fine but I'm wondering what other factors could be inducing this stress.

1. What are your PH Readings / Before Lights on and after Lights Off.
2. What are your salinity readings Before Water Top-up / A hour after water Top Up.
3. How are you dosing Kalk / Buffer / Calcium etc. All of which need to be done incredibly slowly.

Sorry for the questions but I'm guessing a swing of any one value could be stressing your fish out and causing the problems. For your info, my root cause was PH shock induced in the fish, with the PH swinging from 7.7 to 8.5 during thr datlight hours and then back again at night. Everything had ich and all succumbed to it in the end. Now I monitor PH and dose Kalk to stabilize it between 8.4 and 8.6. No more ich.

Anyway, HTH.
brucey