I think Slugger has asked some good questions.....
Lets see if we can sort this out foryou...
First, realize that you have a constant source of ammonia - the little fish and shrimp that are in the tank are eating and making waste. That waste is ammonia. Any waste food or poo that goes into the gravel will also break down into ammonia.
To process this ammonia in a "cycle" you need two different types of beneficial bacteria to live in your tank. The first type processes the ammonia into nitrite, the second makes the nitrite into nitrate.
These bacteria will "appear" from the environment after a time - 1 week to 10 weeks. But they will not take up residence in a tank where they cannot find "food" and warmth. You have supplied the warmth. But there is a question as to the "food".....
The white chips you are refering to are most likely zeolite or ammonchips. Carbon is black. Zeolite is a chemical compound that binds to ammonia, making a new chemical compound in the process. This new chemical compound essentially removes the ammonia from the water by making it into something else. It is a great product EXCEPT, by binding this ammonia and changing it, it also removes it from the bacteria's dinner plate. They cannot use it. So they cannot grow.
Zeolite can only hold so much ammonia. After a bit, it will no longer be able to bind up any ammonia, and the ammonia will be available again in the tank - to bother the fish/shrimp and for the beneficial bacteria to "eat".
YOu added floss from an established tank to your filters. This is GREAT! It was most likely nicely colonateed with beneficial bacteria. But if your zeolite removed all the ammonia before the bacteria could get it, chances are the bacteria did not grow a nice colony. It may have died out all together. Depending on what platform you have left in that filter (an Eclipse has a biowheel and a cartridge, right?) you may still have some bacteria in the tank, just very little. Biowheels take a looooong time to colonize - longer than many other types of media. They are great platforms, though. For a lightly stocked tropical tank, an Eclipse filter/wheel is a great set up and will need little or no supplementation to cycle well.
When you removed the floss, you may have removed the majority of the benficial bacteria - depending on how long you had it in, how much zeolite was there, etc. It is questionable as to how much beneficial bacteria managed to move over and colonate the bio-wheel. It typically takes 2-4 weeks to properly colonate a filter media from one to another.
The nitrates you are seeing could have come from several places other than a cycle. First, your tap water may have nitrates in it. Many waters do. You may wish to test the tap water.
Second, since you seeded your filter nicely with the floss, it is entirely possible that you had a small, but good cycle going for a time - and it produced the nitrate. YOu may even have a small cycle still going - just not a robust enough colony of bacteria to process ALL the ammonia the fish/shrimp produce.
Finally, the ammonia clear is most likely a water additive much on the order of Amquel or Prime, I am assuming. I cannot find any information on line about exactly what is in it. Look on the package. Most water conditioners will bind the ammonia into a compound that DOES leave it available for the beneficial bacteria to process. That type of conditioner is a good thing to have. I think I would like you to read this article about Amquel, though. It will apply to any water conditioner that binds ammonia, yet still allows the bacteria access to the ammonia.
http://www.kokosgoldfish.com/Amquel.htmlI would suggest that you remove the white chips from your filter. Change out 25-50% of your water. Do not be afraid - the bacteria is not in the water in any numbers worth worrying about unless you used a starter like BioSpira.
If you can, get some more floss from the tank at work. Bring it home - keeping it warm and wet - and place it in your filter on top of the blue cartridge.
If the ammonia clear states that it leaves the ammonia available for the beneficial bacteria to use, feel free to use it as you wish to help keep the ammonia in check.
Then you are going to have to do hard water changes, guard that filter floss like a baby, and treat with the ammonia clear and wait for the cycle to go.
There is one other possibility. There are some types of test kits that do not read correctly with various additives. For instance, your Ammonia Clear may be binding all the ammonia in the tank and rendering it harmless to the fish. The ammonia is still there - it is just in a harmless form. The bacteria can still use it. But your test kit does not know that - it only reads ammonia. What type of test kit do you use?
If you are unsure about what Ammonia Clear is doing or how it is processing the ammonia, I would suggest switching to Amquel+ or Prime. They will do the same job for you and I know they will leave the ammonia available for the beneficial bacteria.
Please post back and let us know how you are doing!