I do not know Amquel but tried "stop amo" from prodibio and "prime" from Seachem and none of them reduce the amonia in 12 hours time.
How were you testing for ammonia and how much did you observe?
I explain why some types of kits are not going to give accurate results with some ammonia binders here:
Ammonia and the Reef Aquarium
http://reefkeeping.com/issues/2007-02/rhf/index.php
from it:
The distinction between these methods can be important, as some combinations of ammonia binding products and test methods can lead to false ammonia test results (either causing apparent ammonia presence when it is bound, or simply causing a color that is not predicted by the test kit). For example, a Nessler type kit cannot read ammonia properly if the aquarist is using Amquel, Seachem Prime or related products to bind ammonia. The result is often an off-scale brown color.
So, it is particularly important that aquarists understand how the test kit that they are using, and the binder that they are using interact, and the manufacturers of each are the best place to find such information.