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I trust my hanna.I too thought my phosphates were 0 until I purchased a Hanna Phos Checker. Now I need to lower phos. what showed 0 now shows .15 on Hanna. good luck.
Stop dosing aminos it is only adding nitrogen/nitrate that isn't feeding your corals but bacteria.
Got my hanna checker in and first test came out at 0.01phos. Over a couple days I got it up to 0.03, and when I tested the next day it dropped to 0.01 again. I had to start dosing neophos at about triple the recommended dose to get it to raise to the 0.03.
Seems to have dropped pretty fast, or could just be the variability of the tester?
Randy , when getting phosphate to a stable level will it bring the nitrates down at all?Could be either, but it may take large doses of phosphate to overcome binding the calcium carbonate surfaces as you try to raise it. I'd raise the daily dose more.
If phosphate is presently limiting the growth of an organism, such as macroalgae, then yes, nitrate may begin to decline faster.Randy , when getting phosphate to a stable level will it bring the nitrates down at all?
And what level do you shoot for if there is 15-20ppm nitrates?