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There are three major reasons you can have high ammonia in your tank.

First, you could have a dead fish in there. When a dead fish rots it makes ammonia. LOTS of ammonia. So, check your tank for dead fish.

Second is overfeeding. The food the fish don't eat sinks to the bottom and rots, and rotting anything makes ammonia.

Third is that you put too many fish in the tank too soon after you got it. There is a process going on in your tank called the nitrogen cycle. Not to put too fine a point on it, but fish pee has ammonia in it, like all pee does. There are bacteria in your tank that convert the ammonia to nitrites, then to nitrates, and finally to nitrogen which evaporates into the air. If you put in all the fish you want to have right after you get the tank set up, this cycle (which takes some time to get started) doesn't have a chance to get going and you get high ammonia levels.

My advice would be to move the fish to a different aquarium--right now, a 5-gallon bucket with dechlorinated water in it and a power filter on it will work as long as you've got small fish--break down the tank, wash the gravel really well, set the tank back up, put "cycle aid" in it to get the nitrogen cycle started quickly, then put half the fish back in the tank in two days. After a few days put the rest of them back.

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