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Old 04/01/2017, 08:38 AM   #1
Stevorino
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Dosed Phosphate RX for first time - Kill Chaeto?

I haven't been focusing on phosphate for a while... I've been relying on heavy water changes instead of scrubbing out the phosphate. But last weekend I finally decided to buy a hannah checker and Phosphate RX.

Before dosing, Hannah Checker had Phosphate at 0.18

Dosed in day one aggressively and it dropped to 0.07

Dosed day two and it dropped to 0.00


Before dosing at all I took a basketball sized chaeto tangle out of the sump and left about two softball sizes worth remaining.

Here we are a week later and the two softballs of chaeto are shrivelled up and gone. Tank looks great.

Is it possible that I literally stripped the tank of the phosphate enough to kill off the chaeto?


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Old 04/01/2017, 09:55 AM   #2
tmz
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Yes. IME chaeto wanes when PO4 levels go below,0.05 ppm or so. Corals may also suffer from a phosphate deficiency at some point.


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Current Tank Info: Tank of the Month , November 2011 : 600gal integrated system: 3 display tanks (120 g, 90g, 89g),several frag/grow out tanks, macroalgae refugia, cryptic zones. 40+ fish, seahorses, sps,lps,leathers, zoanthidae and non photosynthetic corals.
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Old 04/01/2017, 10:24 AM   #3
Stevorino
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Thanks tmz!


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Old 04/01/2017, 09:27 PM   #4
tmz
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you are welcome


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Current Tank Info: Tank of the Month , November 2011 : 600gal integrated system: 3 display tanks (120 g, 90g, 89g),several frag/grow out tanks, macroalgae refugia, cryptic zones. 40+ fish, seahorses, sps,lps,leathers, zoanthidae and non photosynthetic corals.
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Old 04/02/2017, 11:13 AM   #5
tlc
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the aggressive drop in po4 may have contributed also. reef tanks are like cruise ships. changes should be made very slow.


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Old 02/01/2018, 09:13 PM   #6
ant123mon
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I don’t trust the Hannah phosphate tester. Different reading every test. I have both high range and low range checkers high range says 1.5 with accuracy +-1 seems pretty high window of error. Low range test zero +-.04 I gave up on them and ordered a Milwaukee. Granted perhaps I’m testing wrong but don’t believe so. I have read else where these aren’t accurate


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Old 02/01/2018, 09:38 PM   #7
rvareef
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Quote:
Originally Posted by Stevorino View Post
I haven't been focusing on phosphate for a while... I've been relying on heavy water changes instead of scrubbing out the phosphate. But last weekend I finally decided to buy a hannah checker and Phosphate RX.

Before dosing, Hannah Checker had Phosphate at 0.18

Dosed in day one aggressively and it dropped to 0.07

Dosed day two and it dropped to 0.00


Before dosing at all I took a basketball sized chaeto tangle out of the sump and left about two softball sizes worth remaining.

Here we are a week later and the two softballs of chaeto are shrivelled up and gone. Tank looks great.

Is it possible that I literally stripped the tank of the phosphate enough to kill off the chaeto?
yes, do you have corals in the tank?


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Old 02/01/2018, 09:48 PM   #8
Tripod1404
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Quote:
Originally Posted by ant123mon View Post
I don’t trust the Hannah phosphate tester. Different reading every test. I have both high range and low range checkers high range says 1.5 with accuracy +-1 seems pretty high window of error. Low range test zero +-.04 I gave up on them and ordered a Milwaukee. Granted perhaps I’m testing wrong but don’t believe so. I have read else where these aren’t accurate
They are very accurate. I have been using them for a long time and I was able to cross-match the results with ICP/triton analysis within few units of ppb. You are probably doing something wrong.


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Old 02/05/2018, 01:17 AM   #9
Misticl
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@ant123mon how is the Milwaukee tester. I have been wanting to order one as I see many post about the cost and inaccuracy of the hanna. I have to call up some of the extreme inaccuracies of the Hanna checker to people not understanding how it works. Does Milwaukee take the user error out of the equation?


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Old 02/05/2018, 05:40 PM   #10
bertoni
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I thought that the Milwaukee tester was just a repackaged Hanna model. The stats are the same.


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