Ok.. so 3dkh in 2 weeks is more believable given the corals you state you have..
You can certainly test every 2 days.. Just make sure to record when you are doing water changes also so we can see how your levels are with that in the equation..
Then come back in 2 weeks with all that data and we should see a clear trend.. I'd recommend testing before a water change and then a few hours after one too each time you do that water change..
I'm not sure if you just have 1 test result so far but lets not react on a single data point...
You do have "some" corals.. Not heavily stocked by any means and I'd guess that 20% every week "should" be close to keeping you stable.. But lets get multiple data points/test results to see..
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