It may not be from the coral unless they are quite large. there may have been a difference in the amount of food that was uneaten, algae growth, decaying food scraps, etc. multiple things can make these changes, even the test kit itself can give different readings.
filtration and water changes have a big effect on nitrates, along with your skimmer if you have one
Let's see if Mr. Mayor agrees and can help.
DoneSorry you're having some trouble, RW!
I think you may get more help if this thread get's moved to the general forum or the reef chemistry forum, that way more people will see it
@Crabs McJones what do you think? Thanks for your help!
Thank you, Mr. Mayor!
By how much did it drop by? What was the starting NO₃?
Interesting. Are the corals growing? What about algae?
