I am really afraid I do not truly understand all of your question.....so lets see if we can take it apart and find out what to do, ok?
You should test the water you are using for the tank and find out what is in that water. You are using tap water from the refrigerator filter, correct? Those filters do an ok job at filtering out large particles and some of the smaller stuff, but not too much else. Your water should be fine. Take a look, though and see if it has any nitrates or ammonia in it to begin with. (if you do not have an ammonia test, that is fine at this time, but it is definately something you will want to look into in the near future.

) What is in your tap water?
Secondly - since you do not list your ammonia levels, I am assuming that your tank is in the middle of a beginning cycle. First the ammonia will build, stimulating the first type of beneficial bacteria to grow. These bacteria process the ammonia into nitrite. This nitrite in the tank will stimulate a second type of beneficial bacteria to grow. This second type of bacteria will process the nitrite into nitrate.
When you get enough of both the types of bacteria growing in your tank, they will effectively process all the ammonia and nitrite your fish produce - leaving you with nothing but nitrate in the tank's water. This nitrate needs to be removed on a regular basis - through water changes or a combination of water changes and real plants. Nitrate is a fertilizer for plants - algae and other plants love it and will grow well with it. It is difficult to get enough plants in a tank to completely take care of all the nitrate messy goldfish can produce, but, with waterchanges and/or plants, you can effectively keep the nitrates down below about 40ppm.
Lets look at what you have -
Unknown ammonia. I am going to assume that since you are seeing nitrites, you have zero or at least very low ammonia. This means the first type of beneficial bacteria have grown in your tank's cycle. This is GOOD!
Nitrite is at 2.0 This means that the second type of beneficial bacteria has not grown a large enough colony to be able to process all the ammonia waste that is being turned into nitrite by the first type of bacteria.
Nitrate at 80 ppm. This means that
either your tap water contains nitrates, or you have some of the second type of beneficial bacteria working for you (or both). You just do not have enough of it to take care of all the nitrite, but you have
some. The fact that you are seeing nitrates is also GREAT. It means that your tank is almost completely cycled.
Now: You have noticed that your nitrites are lower than usual. That may be because your second type of beneficial bacteria is now just beginning to grow into the bio-load the fish are giving it. Once you start seeing nitrates, you are almost there. The colony of bacteria will bloom and you will see the nitrites drop quickly and the nitrates climb quickly. You then do a series of water changes to keep the nitrates ok, and you are home free. Your tank is cycled.
Untill all the nitrites drop, you may want to add a small amount of aquarium salt to the tank's water. A Tablespoon of coarse grained aquarium salt for every 5 gallons of water will bring the salt concentration to approximately .1% - a good level for a tank that is just about ready cycle completely.
I do not know what bottle you are reading - but, if you are not adding any water conditioners that absorb ammonia or nitrite or nitrate, or using zeolite or the ilk in your filters, you should be just about ready for a completely, happily cycled tank for your fish.
Change out a portion of the water to get the nitrates and nitrites down, and add the salt to .1% and keep testing. With luck, you should see the nitrites drop quickly now.....