my ? for that is if you have too much ammonia would it benefit the cycle using one of those "bacteria booster capsules", I've never done it but its something i started wondering about with this post.
These bacteria booster are also unnecessary because the bacteria that they are providing for you are ubiquitous—they are already available everywhere in the environment, so they are readily available to your fish tank. Once they get into the fish tank and have access to that food source, they will begin to multiply. This is what is happening when your tank is cycling.
As far as adding more bacteria booster with each water change, this is only viable as a money making scheme for the manufacturers of the products. First, assuming that the bacteria are actually live in the bottle (and hoping that they are not so far gone as to be replaced with their toxic anaerobic counterparts), your tank can only support so much bacteria in its biological filter. The amount of bacteria that your tank can sustain is governed by several factors, including:
The amount of food (fish waste) available for the bacteria to consume
The amount of solid surface area available for the bacteria to colonize
The amount of oxygen available for the bacteria to consume when processing the fish waste (this is in addition to that needed by the fish and plants [yes, plants need oxygen])
The overall water volume
The ability of the water to dissipate the bacteria's own waste
The flow rate of the water
And the availability of these things in conjunction and consistently over time
So, if your tank has finished cycling, it will have as much of a bacteria colony as it can support, based on the resources provided. Adding more bacteria to the system will only result in a die-off of bacteria within the tank as a whole and a temporarily loss in stability of the biological filter until the system can re-assert itself.
