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A general answer would be to maintain detectable levels of NO3, PO4, K, and traces. Of course with slow growers, you would have to add less fertilizers to maintain these concentrations because nutrients aren't being consumed as quickly as a fast-growing tank. How much exactly? Well that depends on how much light is illuminating this tank and whether or not it is supplemented with CO2.

For example, Shene'ne' adds 1 tsp on Day 1 to a fast-growing tank to get 10 ppm. By Day 3, only 5 ppm is left over, so she adds 1/2 tsp to bring it back up to 10 ppm. Similarly, Monique adds 1 tsp on Day 1 to a slow-growing tank to get 10 ppm. By Day 3, only 8 ppm is left over, so she adds 1/5 tsp to bring it back up to 10 ppm.

As you can see, Shene'ne' has to add MORE fertilizers to her fast-growing tank in order to maintain the SAME concentration as Monique's slow-growing tank.
 
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