Refugium and CO2 scrubber compatibility

Klyph

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Could a CO2 scrubber have a negative effect on a refugium (theory being the plants in the fuge need CO2 to grow)?

I’ve been struggling to keep my chaeto healthy. One of the many things I did when trying to revive it was undo my co2 scrubber. Now that my chaeto is improving, I’m considering setting the CO2 scrubber back up, but wanted to get this groups thoughts, before doing so.
 
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arking_mark

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Could a CO2 scrubber have a negative effect on a refugium (theory being the plants in the fuge need CO2 to grow)?

I’ve been struggling to keep my chaeto healthy. One of the many things I did when trying to revive it was undo my co2 scrubber. Now that my chaeto is improving, I’m considering setting the CO2 scrubber back up, but wanted to get this groups thoughts, before doing so.

I don't think lack of CO2 is the limiting factor for Macroalgae growth. I'd look at other parameters or algae that may be outcompeting the chaeto.

I'm having a similar issue, but have not tracked it down. My chaeto isn't doing great in my refugium. I have plenty of GHA in there and have started dosing ChaetoGro.
 
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Klyph

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I was trying to go without water changes, but now recognize chaeto uses up a bunch of trace elements and then starves itself. I did a big water change and have moved to the triton dosing regiment and my chaeto is looking good again.

@Randy Holmes-Farley ... is my concern stated in my subject line a valid concern?
 
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Klyph

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I was trying to go without water changes, but now recognize chaeto uses up a bunch of trace elements and then starves itself. I did a big water change and have moved to the triton dosing regiment and my chaeto is looking good again.

@Randy Holmes-Farley ... is my concern stated in my subject line a valid concern?
/bump

anyone have any thoughts on this?
 

Randy Holmes-Farley

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Many marine macroalgae use bicarbonate instead of CO2 as their source of CO2, so pH is not an issue for them.

If the pH is not "high", then there is certainly no concern. I grew caulerpa and chaeto at pH 8.35 to 8.55, but might they have grown better at pH 8.0? Maybe.

This has more. See Table 1:

 
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arking_mark

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So my Chaeto has been completely wiped out of the refugium and the remaining Caulerpa Prolifera is not really proliferating as expected (pun intended). My tank pH is always around 8.3 and dKH has been 7.1 to 7.4 which makes me believe that my tank CO2 levels have been below 350 (Marine Tank CO2SYS Table - Google Sheets). I've been struggling with Alk stability and have been trying to normalize around 7.7dKH.

Tank is now 6 months old and has never had any algae to speak of. I've been doing heavy feeding and NO3/PO4 are usually above 0 (last week, I measured NO3 = 3ppm and PO4 = 0.03ppm). I dose ChaetoGro and use a Kessil refugium light.

I'm beginning to suspect that maybe the low CO2 might be impacting my ability to grow Chaeto?
 

PeterC99

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So my Chaeto has been completely wiped out of the refugium and the remaining Caulerpa Prolifera is not really proliferating as expected (pun intended). My tank pH is always around 8.3 and dKH has been 7.1 to 7.4 which makes me believe that my tank CO2 levels have been below 350 (Marine Tank CO2SYS Table - Google Sheets). I've been struggling with Alk stability and have been trying to normalize around 7.7dKH.

Tank is now 6 months old and has never had any algae to speak of. I've been doing heavy feeding and NO3/PO4 are usually above 0 (last week, I measured NO3 = 3ppm and PO4 = 0.03ppm). I dose ChaetoGro and use a Kessil refugium light.

I'm beginning to suspect that maybe the low CO2 might be impacting my ability to grow Chaeto?
The usual culprits for chaeto not growing are three things:

1) Lighting
2) Flow
3) Not enough NO3 & PO4

Probably not CO2.
 

arking_mark

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The usual culprits for chaeto not growing are three things:

1) Lighting
2) Flow
3) Not enough NO3 & PO4

Probably not CO2.

Kessil h160 refugium at full power means it's probably not #1.

Has about 400 gal/h flow, so it's probably not #2.

NO3 / PO4 seem to be in the recommended range.
 
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PeterC99

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Through the sump.

The Chaeto was always up against the egg crate interfering with flow. I'm thinking of building an egg crate pen to keep it more contained for my next batch.
Also your NO3 & PO4, while great, are very low. Your corals are completing for those nutrients and there is not much to go around. Also what is your light schedule?
 

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