Everyone is dying

Thanks for the responses, I've just done some more tests and another water 25% water change yesterday. The results are the same, nothing wrong there, the kit does still work I used it to monitor a cycle.

Last night around midnight I checked the tank, the sick female was lying on her side just barely alive and the other fish were starting to pick at her. I decided to put her out of her misery.
And this morning I lost another male. Thats 4 fish in two days.

If it keeps up at this rate the tank population will have dropped to 0 before the weekend is over.

On the upside, a female I removed from this dying tank two weeks ago just dropped her fry and she is doing well.

Thanks again for the replies
 
Still... the gasping sounds like ammonia to me... Esp with all the recent changes of gravel etc. The only time my fish gasp is when I do a heavly cleaning and change media too fast or have not borken down the filter and cleanned it so it gets proper flow.

Is the tank cloudy?????
 
The tank is clear, tests show ammonia at zero.

The last two to die, yesterday and this morning, both showed no signs of the gasping that the other fish had. It seems that half of them show this syptom and the rest show nothing. I've looked closly at all the uneaten bodies and can see nothing wrong.

The filter media smell old, I mean it smells like the media from my other tanks. The tank even smells healthy, they're just dropping dead.

The tetras seem to be holding out well, save for the one, I guess they are tougher than the guppies. I am going to the fish store later today, is there anything I should try picking up?
 
Noe, started a few days before my weekly water change. Bubbles? The bubbles created by the output on the filter rising to the serface and sit for awhile, but nothing I noticed was strange. After another death on Saturday things seem to have slowed down a bit. Didn't have the chance to speak to the guys a the fish store about the problem (was looking for bird cages not fish)

Anyway the death toll is pretty high. The tank will not recieve new fish and no one will be moved out of it for at least a month, until I am sure that everything is back in order.
 
If it was gas emboli then there would be more bubbles than that.

Velvet seems to be going around right now and wiping out entire tanks.
 
The population of the tank has now dropped again. I lost a few more males, but the deaths are occuring less often now, again, no physical symptoms. The tetras seem to be alot better off than the guppies, who all appear heathly for the moment.

Is gas emboli something like 'the bends' that divers get? Never heard of that one before. There are no velvet syptoms either. I will just have to wait and see this time. The friend that I got some of the guppies from says to make sure that the tanks occupants remain isolated from my other tanks. Unless something miracules happens I will stop replying to this thread.
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Thank you all for trying to help.
 
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