I agree, its probably the stress coat breaking down chloramines in your water, and other factors (partial decaying of driftwood, partial decaying of plants, etc.). Wait for the ammonias to disappear before starting your cycle.
That said, fishless cycling with plants is generally _not_ suggested. Even a short term ammonia spike in your water, coupled with lighting (for your plants) will most likely result in an algae outbreak. Either do a fishless cycle without plants, or do a fishy cycle with plants. If you plan on cycling with plants, I would suggest the following:
1.) Pack your tank with as many cheap/fast growing plants you possbily can.
2.) Give your tank a day or two to settle in (In the meantime get CO2 injection going, if you plan on using it).
3.) Add your herbivores (aka. algae eaters, be it shrimp, a couple of SAEs, or whatever). During this phase, be careful not too add too many fish. Although the smaller herbivores (ie. SAEs, C. japonica shrimp, otos, etc.) don't generally produce too much waste, it is still quite a possibility that they might produce more ammonia (fish waste) than the plants can take in.
4.) Give your tank a month (or more) to settle with the herbivores.
5.) Slowly start to add your fish.. a couple every week or so. Also, be careful loading fish here. Bacterial colonies are not as populous as they would be in a FO (fish only) tank. So overloading the biofilter is quite possible as well.
6.) After you've added all the fish you want, you can start to _slowly_ remove and add other kinds of plants. Don't remove too many plants at once, you need to give your biofilter a chance to compensate for the loss of your plant "filters".
I suppose I should add, I would look at getting a different dechlorinator. I personally use Seachem's Prime. Slightly more expensive per bottle, but its more price effective as less treats more and it removes any ammonia that is produced from the breaking of chloramine.
I would suggest doing a large water change to remove the ammonia in your water asap (or at least to a very low level). With the lighting your plants require, you may experience an algae bloom (like what I said before).
HTH
-Richer
Best if luck to ya.