Cycling the tank

Well I bought my three little fish and all I had to do was wait about four to five weeks for the tank to cycle, which as I stated on the previous post I knew nothing about. So I did my best to research what it meant, and from what I could figure was that as the fish were fed and produced bio waist, that would in turn crate nitrates in the water which in turn would create nitrites, or something like that. At this point I had no chemistry kit to test the water so I had to bring a sample to the store and I relied on them to tell me how everything was doing. Another thing I was to do was to take notice of the different colour algae blooms, it was supposed to go green, brown, red, and back to green again. I never noticed anything much more then a slight change in colour that showed up on the gravel and all the tests that I did at the store came out perfect, no traces of anything. One thing that I forgot to mention that during that first month was that I had read that providing the tank with fresh air was a good thing, well one night I forgot to shut the window and the next day two of my fish were looking pretty sick. They were really pale almost white and they moved slow, well the next day one died and the other fish was missing. Well off to the pet store again to buy their replacements, two more damsels which I named David and David. I learned the hard way (which I tend to do) temperature change is a really bad thing and needs to be monitored extremely closely. So a month went by and everyone at the store agreed, my tank must have finished cycling and it was now o.k. to add different fish, the only problem was that those yellow tailed damsels were mean fighting fish and I now had catch them. Well about week after adding David and David to the tank that missing fish came to the surface and was hiding at the top of the tank. This was good because it was a week after I added David and David that I learned that these Damsel were not to be kept and they were only there to help the tank cycle. So I caught him and put him in a breeder isolation container which acted as bait to catch the other damsel. At this point Larry Died, Curly was captured and so was one of the Davids, that only left Mo and the other David, and of course Zena my six lined wrasse. The clerks at the store figured would be OK, hopefully, and if they were too aggressive we could try and catch them again.