Just a couple of questions.
How long have you had the tank?
When did you add the fish?
Did you cycle the tank first? In the beginners corner there is a subtitle called "cycling" read that and it will give you a better understanding of what i mean about cycling.
I'm pretty sure if you have really high ammonia that's what's causing him not to eat he's probably quite sick.
Your ammo lock will turn the ammonia into a less toxic form but won't get rid of it.
Keep up regular water changes and try to get your ammonia levels down to under 1ppm. You may have to do 1 or 2 a day, make sure you use a dechlorinater every water change so that you dont kill off the good bacteria you need to help get rid of the ammonia.
Also if you can lower your ph level to about 6.5 or so it reduces the toxicity of the ammonia. This can be tricky because the high ammonia can give you a high ph reading so you can fill a bucket with water adjust your ph in the bucket first if you like and add it to the tank gradually.
But don't panic your at the right place for some help. If you get stuck ask more questions.
Last edited by escamosa; 02-27-2009 at 10:11 PM.
Three-fourths of the Earth's surface is water, and one-fourth is land. It is quite clear that the good Lord intended us to spend triple the amount of time fishing as taking care of the lawn. ~Chuck Clark