Hello rya73,
I am gladly you have learned your lesson. Unfortunately a lot of people have to learn it the hard way. It is why on the average goldfish only live for 3 weeks after sold.
Your tank is about 44 gallons.
As a common rule,
A single common goldfish requires 40 gallon of water. And a 55 gallon tank is needed for just two of them.
If you get fancy goldfish instead of common goldfish, the first one needs 20 gallon, and 30 gallon is needed for just two.
You made the mistakes of overstock your tank with way too many goldfish. In a uncycled tank too.
So now you are doing the right thing by fishless cycling your aquarium before getting any fish.
What you need to do is to continue dosing a little fish food every day to maintain a constant source of ammonia.
You need to wait for ammonia and nitrite both reach 0ppm (under the condition of) you are still adding new fish food every day. The goal is to have your aquarium develop enough good bacteria to be able to convert a good amount of ammonia to harmless nitrate. Any trace of ammonia and nitrite is toxic to the fish.
After you have completed your fishless cycling, make sure you do not overstock your fish tank again. Your tank is enough for 3 to maybe 4 fancy goldfish, but only 2 common goldfish at most.
If you wish to get a lot of fish, you might as well go tropical, and get schools of small tropical fish. Your tank is enough for dozens (actually 30~40) of small tropical fish of 2~3" long.
