Co2 Diffuser

[StevenF]

 
 
i just go by the instructions on the bottle

Lets assume your plants are not consuming any fertilizer. And you dose your tanks with 20ml of fertilizer, this is what will happen:

1. In your first water cycle you remove 50% of the water and then add another 20ml of fertilizer.  You are now dosing the water to 150% of the manufactures recommendation (30ml).
2. In your second cycle  you remove 50% of the water and then add another 20ml of fertilizer.  You are now dosing the water to 175% of the manufactures recommendation (35ml).
3. In your third cycle  you remove 50% of the water and then add another 20ml of fertilizer.  You are now dosing the water to 187% of the manufactures recommendation (37.5ml).

Eventually the number will stabilize at about 200% of the amount the manufacture recommends.  Some plants cannot handle fertilizer levels this high.  The water is becoming toxic to them and growth will slow or stop.  Now instead of dosing based on the size of the tank you dose based on the amount of water you put in.  The following wil happen.
 

1. In your first water cycle you remove 50% of the water and then add another 10ml of fertilizer.  You are now dosing the water to 100% of the manufactures recommendation (20ml).
2. In your second water cycle you remove 50% of the water and then add another 10ml of fertilizer.  You are now dosing the water to 100% of the manufactures recommendation (20ml).
3. In your third water cycle you remove 50% of the water and then add another 10ml of fertilizer.  You are now dosing the water to 100% of the manufactures recommendation (20ml)

The fertilizer level will stay at 100% of what the manufacture recommends.  If you look at the fertilizer label it will state that the dose may need to be adjusted based on the number of plants in the aquarium and the desired growth rate.  In many cases more fertilizer will result in more growth.  But in some cases more fertilizer will result in less growth.  Since different plants will have different growth rates and different nutrient needs it is often impossible to know exactly how much much fertilizer you need.  As a result you need to tune the dose through trial and error.