Not getting the growth/color I want out of my sps. Thinking about giving Zeovit a try. The dosing doesn't bother me as long as there is a payoff.
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I truly doubt that your P04 is at 0 unless you are running GFO hardcore. At that point, your sps will begin RTNing. Just take the GFO offline for a week or so until you truly need to use it again to lower phosphates.I use both a Hanna checked and Red Sea test kit for po4 and both show 0. I have two mp40s and two Mp10s for flow at 100%.
If you are getting the brown film algae, that means your system has nutrients due to overfeeding and your GFO has been exhausted.I change my gfo every month. Guess I should lay off a bit lol I just always change it because I end up with annoying brown film algae

