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This is a bit of a poser, and I'm going to go out on a limb and suspect the miracle mud, since it's the only thing in there I'm not familiar with...and it is live, and may have some dieoff.
If your cheato is growing that fast it's pulling a lot of phosphate---this is GOOD, but it's not good to have that much phosphate.
What test are you useing and are you sure of your test?
Do you have any carbon bag in there that is older than 4 days? They can start contributing to nitrate in time.
Your sandbed is way shallow: I'd up that to 3-4" to let it layer bacteria a bit: that would help with nitrate processing.
Lace rock. Not the sort that's red and white, I hope: [metal]...rather the gray stuff? No volcanics: [metals.] I can't believe there ARe metals if you have good growth.
I'm just wondering about that nitrate test. Do you have the same reading at your lfs?
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Sk8r
"Make haste slowly." ---Augustus.
"If anything CAN go wrong, it will, and at the worst possible moment."---St. Murphy.
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