Basically it isnt wise to use any chemicals in your tank (other then clorine/chlormaine remover of course) most chemicals are a waste of time and money and do meerly nothing other than prolong your cycle.
Most LFS are inexperienced or just want to make a quick dollar so yes they will recommend this miracle chemical and that "new" product thats just gonna cycle your tank in 2 hours. DON't listen to them.
You need to learn about the cycling process of a tank. As you have already added fish to your tank before it was cycled (WHICH MOST OF US DID WHEN WE FIRST STARTED including myself), you will need to do frequent test AND frequent water changes to combat your ammonia and nitrite levels as they grow until your tank has cycled.
I like this thread for more information for you.
http://www.myfishtank.net/forum/fre...explain-cycling.html?highlight=nitrogen+cycle
Adding more fish at this time would not be wised, once again you need to wait till your tank is cycled.
The best thing you did was to go looking for information on here. We all have had experience, both good and bad, in this hobby, and you can learn from the mistakes that we have made lol.
Good luck with your tank. and PLEASE don't be afraid to ask questions no matter how "dumb" you may think they are.
Btw what kind of test kit do you have. The most recommended and most accurate is the LIQUID drop test, made by API (aquarium pharmaceuticals inc.) the strip test are not as accurate. Api's Test kit also gives more test for the money, therefore being more economical, with your first tank and just starting out you are gonna be doing a LOT of test. just keep that in mind
EDIT: I just re-read your first post, you say you have had the tank running for 2 months? It should have been cycled by now (even by accident haha), so if your having ammonia spikes now (your 1ppm = a spike) then you need to find out why, are you over feeding and leaving the left over food to decay? is thier a dead fish in there maybe? and dead rotting plants? if you cleaned the filter how did you clean it? (a filter sponge/pad should only be cleaned in USED tank water and NOT in fresh untreated tap water)