Yes you are missing something. Cycling means making a tank safe for fish from all the nitrogen compounds- ammonia, nitrite and nitrate. How much there may be to handle of all this stuff mostly depends on your fish load. This is not simply the number of fish one might have, but their total body mass. Mass is a fancy term for size here. One small Tetra does not eat, poop or breath as big as much a a great big oscar. But have enough small tetras and their total mody mass eventually is similar to that of the lone oscar. The amount of ammonia any tank produces is directly related the the total body mass of all the fish in it. Notice we have not involved any math here, only the idea the the bigger the fish, the more waste it makes.
Now for the next part. The more waste a tank may have made in it, the more waste must be filter out. In terms of the ammonia etc. this means the more bacteria that are needed to handle the job the greater the amount of ammonia being created. Basically, the more ammonia that must be handled, the more bacgeria that are needed to do the job.
Now comes the math. If you have two identical tanks which differ in just one respect, how many fish will go in, then you know the amount of ammonia created in each tank will be different. Keeping it simple, lets say that there are twice as many fish in one tank as in the other. What this means is one tank will need twice as much bacteria as the other. And common sense (not math) tells us that the more bacteria one must develop, the longer that must take.
So now you should have learned that the amount of time it takes to cycle any given tank depends upon how much cycling it needs. The more fish that will be going in, the more bacteria it will need and the longer it will take to develop them.
Or, it take less time to establish bacteria able to handle 1 ppm of ammonia than the number of bacteria needed to handle 2 ppm, etc.
Mow you are lucky here as almost no math is involved for you to do. You must be able to count so when you put the drops used in testing you put in the proper number. The test results do not involve any math, you need to match colors not multiply. Finally, even the math needed to calculate amount of ammonia you should add is made simple here because we have a calculator for this on the site. Again you do no math, you merely enter the numbers you know- like the volume of your tank, the strength of your ammonia and the desired level (i.e. ppm and usually 3) and the calculator gives you the answer.
If you can read, if you can count and if you can see in color, you only need to do one tiny bit of math to know how much your snack dose should be. You divide the amount of your full dose by 3. If you are unable to do this you can ask for help here.
Basically, to cycle one needs two set of skills- the ability to use a test kit and to measure a few ml of liquid. If one is unable to do this or to get help doing this, I would advise against keeping fish at all.
My offer still stands. I have yet to fail when working with any new fish keeper one on one to help them get their tank cycled. If you can follow directions,
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