How long have you been cycling your tank for?
Sometimes the ammonia can be a bit troublesome so if it's over 6 weeks it might be that it's being affected by your dechlorinator or you're looking at it in a bad light.
Edited: Sorry, if you're using test strips that comment about the light doesn't make any sense. I would order an API test kit.
Edited again: Just saw your other topic. NO, YOUR TANK IS NOT CYCLED. It has been FIVE DAYS. It takes up to SIX WEEKS and won't even have begun properly yet.
I did a fish-in cycle because I knew no better (although there really is no excuse for ignorance in this day and age) and it was hard work changing the water twice a day for six weeks, and horrible to watch and wait. I was so lucky that everyone got through it and I would never ever do it again. You have already lost fish so you are obviously not doing very well at it! My advice would be take the poor fish back and do a fishless cycle.