Mysterious plague wiping out my tank

[fishilover]

In my 40g tank I had;
2 angels
1 ram
1 krib
2 ID Sharks (shouldn't be in there I know)
1 cory (getting more)

In the last 3 days I've lost;
1 angel
1 krib
2 ID Sharks
1 Ram that is really sick but not dead now(being quarentined)

I just moved a few plants around in there could this have killed them it's like a mysterious plague wiping out my tank what could be happening? I tested the water with 3 tests and they were all fine,and the filters clean.

Any info on whats happening or what could help is greatly appreciated

 

[Jchillin]

Sorry to hear about your losses . This really should be in the "Unhealthy Fish" forum. In order to determine what the problem could be, can you answer these questions?:

1~What type of fish is afflicted? In addition, please describe what is wrong with the fish to the best of your ability (i.e. cotton like growth, bloated, etc.).
2~What are your tank parameters (ammonia, nitrites, nitrates, temp, pH)? Please give exact values.
3~ How large is the tank? How long has the tank been set up?
4~What type of filtration are you using? Please give the name and number (i.e. Fluval 304) and amount of gph if known.
5~How many fish are in the tank? What kinds of fish are they and what are their current sizes?
6~When is the last time you did a water change and vacuum the gravel? How often do you do this? How much water do you remove at a time?
7~How long have you had the fish? If the fish is new, how did you acclimate it/them?
8~Have you added anything new to the tank--decor, new dechlorinator, new substrate, etc.?
9A~What kind of food have you been feeding your fish, have you changed their diet recently?

 

[An t-iasg]

Moved to the Unhealthy Fish forum.