Death streak - 4 dead.

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It is an API Master Test kit. Anything below 20ppm is safe for your aquarium as you can't really get less than that. And such a result will not show up in the tests.

The water is not the issue here. It has been tested multiple times and not just by me.

I have just lost another angel fish, in my main tank. He was not transfered from another tank like the others.

REALLY getting tired of this.

Rainbow fish found dead. Less than one hour later. I am screwed.
 
A couple of things, you can't have zero nitrates in a cycled tank. How long has the tank been set up? You said you unplugged the heater, what is the current temperature in the tank? You also said after you unplugged the heater there were no additional deaths over night, what was the temp before unplugging the tank? Do you have any pictures of the fish? The sore on the Discus gill? Anything I can see? How were the fish darting around and for how long before they died? This is a difficult issue to pin down there isn't too much specific info.
 
A couple of things, you can't have zero nitrates in a cycled tank. How long has the tank been set up? You said you unplugged the heater, what is the current temperature in the tank? You also said after you unplugged the heater there were no additional deaths over night, what was the temp before unplugging the tank? Do you have any pictures of the fish? The sore on the Discus gill? Anything I can see? How were the fish darting around and for how long before they died? This is a difficult issue to pin down there isn't too much specific info.

The API Master Test Kit is not sensitive enough to register anything, in my experience. I -know- there is some level of nitrates. However no test chemical based or test-strip based test registers the levels of nitrates in my tanks.
So, unless all tests, done by me AND the store are incorrect the simple truth is (as far as I can tell) my filter is functioning very well.

The tank has been setup for a little over 2 years.

The current temperature in the tank is 76.6F

Correct. I unplugged the heater last night and there were not additional deaths over night. This remained true until this evening when I discovered a small angel has died.
The temp before unplugging the heater was 81F

The fish (aside from the Dicus who became VERY visably sick) behaved normally as far as I can tell.
Is there any specific behavior you're looking for? They eat. They move, they're not lethargic.

This is a difficult issue to pin down there isn't too much specific info.

Yes! Perhaps you see now why I am so upset and annoyed! There is NO apparent reason for these fish to just start dropping dead!

There is something wrong...and as far as I can tell, thus far, it's not water quality. Everyone wants to point the finger at water quality but it seems that, that's just the safest bet! The easist thing to point ones finger at, but it's simply not the problem here.

I do not have pictures of the discus. I can/will obtain and post some picture of current survivors.
 
I suspect this could be viral, I see nothing the pix that suggest bacterial or fungal. This is at best a guess since I have nothing else to go on except that and the description. Try the paragone in the main tank, it might help.
 
I suspect this could be viral, I see nothing the pix that suggest bacterial or fungal. This is at best a guess since I have nothing else to go on except that and the description. Try the paragone in the main tank, it might help.

I take it Paragone is a medication or type of medication?
 
You have some beautiful fish, I am sorry for your losses and can imagine it must be very stressful. Have you had any more casualties since unplugging the heater?
 
You have some beautiful fish, I am sorry for your losses and can imagine it must be very stressful. Have you had any more casualties since unplugging the heater?

Thank you, Celebrist. They are (as I say) "my babies". Yes, it is very stressful and upseeting for me to lose any of my fish, no matter the reason.

Yes. I lost one addional angel. I cannot say for sure, but I am not sure he died for the same reasons the other have. Whatever those reason may be...
 
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