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Stick with the RS kit.
API is commonly know not so reliable IMO and many other reefers.
What is your Po4 (phosphate) set on?
PO4 is 0.006 per hanna checker
Is this the PPB or PPM checker?
Since your No3 is at 20ppm your Po4 isn't bad but it can be higher as I mentioned.
Po4 and No3 are two important factors to have for healthy corals and a balanced bacteria population.
What is your Alk #
It is all personal preference, and I prefer Red Sea
) even with the same brand. What you are looking for is if the numbers are rising and or changing at a alarming rate then one needs to make a correction, slowly. Look at what your tank is doing and stop chasing after numbers that will only make an enjoyable hobby a job
. Use the kits as a gauge.
