my oscar has died suddenly

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Ammonia (NH3) is a chemical that is highly toxic to fish even in small amounts. Ammonia toxicity causes severe stress to fish making them more susceptible to disease and death. This chemical also causes damage to gill membranes and inhibits normal respiratory function. It is important to test the aquarium regularly for this chemical; once a month if your tank is healthy but more often if there are signs of sickness or death. When using a testing kit ammonia traces should be undetectable in your results. The test results are measured in ppm or parts per million and your results should ideally read 0ppm.

Taken from: http://www.aqua-fish.net/show.php?h=aquariumammonianitratesnitrites
 
u have a arowana and a oscar and dont no ammonia is dangerous no matter how much is in the tank. ay dios mio.
 
i dont wanna loose my aro so what would u reckomend action i take i joined this for help not critisism. thank u to those who are being helpful
 
What's with all the negativity towards the OP for?

He obviously is here looking for help, if he doesn't know any bit of Ammonia is harmful then he has a lot to learn, so lets help him.
 
i believe the issue is the filters. a 5 x 2 x2 tank is 150 gallons so there is no way in hell 2 205s can cut it. maybe not enogu movement in the tank so he d9ied of lack of oxygen.
 
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