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Old 09/13/2017, 08:00 AM   #1
BlackTip
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High phosphate, and the tank is doing well....???

The phosphate and nitrate level have been climbing up since April. No live stock addition and nothing changed in my husbandry practice. 12% water change every 2 weeks, I don't overfeed, and the tank is under-stocked.

Nitrate climbed from 0 to 9ppm, but it has stabilized at that level for couple of months.
Phosphate climbed from .02 to .27 and it doesn't seem to be stabilizing. (I tested 3 times with two different test kits)

The tank is doing great, and the corals are thriving and growing - SPS and LPS

Should I do something about phosphate? I am hesitant to use GFO, because the tank is doing well.




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Old 09/13/2017, 08:43 AM   #2
mcgyvr
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If you aren't having algae issues and everything is doing great then no.. don't mess with it..
But I would probably say that you do overfeed if your phosphate is at that point..


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Old 09/13/2017, 10:04 AM   #3
Optionman
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I have even higher nitrate and phosphate levels with great growth and minimal algae. Been considering carbon dosing but afraid to mess with stable system. Will change all my RODI filters first in case that's causing any issues.


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Old 09/13/2017, 03:57 PM   #4
bertoni
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I largely agree with leaving well enough alone. As long as the corals are fine, I wouldn't do anything drastic. I might look into the feeding levels, though, as the nutrient levels might become an issue at some point. We don't have much data on how dissolved nutrients affect our corals, though.


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Old 09/13/2017, 05:46 PM   #5
Optionman
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Just tested.
Phosphate .78
Nitrate >50.

Looking closely I think I'm seeing the beginning of cyno outbreak on back wall and sand. Will increase water changes, syphon, and feed less.

Here's a recent photo of reef.


5EC100C8-1F89-400C-BBFF-A5994A076F01.jpgBE1C9FD1-50E4-4CD6-A295-8AAED7684C9D.jpg


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Old 09/13/2017, 08:06 PM   #6
bertoni
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Well, I'm sorry to hear about the outbreak, but those sound like reasonable steps to me.


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Old 09/14/2017, 08:54 AM   #7
BlackTip
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Thanks guys.


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325G DT. 100G sump. In-sump refugium. SRO-5000SSS. 2 Gyres 150. 2 Water Blaster HY-5000. 2 Razor 320W. Apex Gold. MR2 GFO. 2 800W Heaters. Tunze Osmolater. 2 20g-long QT tanks. Geo 624 CA. 80W UV
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Old 09/14/2017, 12:34 PM   #8
bertoni
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You're welcome. Good luck!


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