Ok.Usually, you can see dead algae on rocks.
I just took a water sample to my LFS to test on their kits, and everything came back as my readings, although the nitrate was a bit lower than I expected.
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Ok.Usually, you can see dead algae on rocks.
I think that is an exaggeration. Low levels are useful to corals, but while there are few published studies, higher levels (0.1 ppm and above) do appear to cause toxicity.