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Old 11/27/2007, 11:28 AM
awatson72 awatson72 is offline
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Lackluster growth of macroalgae in fuge

I've had a refugium setup for about 6 months, it's about 3 gallons, with live sand, some small pieces of live rock, and grape caulerpa and chaeto. Water parms are good, Nitrate < 10, Ammonia 0, Temp 76 - SG 1.024. I run about 10 hours of light, a compact fl, 100W.
My chaeto and caulerpa are alive, but definitely not thriving. I don't think I have any 'pods.
Water from the tanks enters the fuge, then flows out through a 1" bulkhead into the sump.
Anything that jumps out as being problematic to healthy growth of the macro algae?

Old 11/27/2007, 11:36 AM
svb57 svb57 is offline
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Lack of CO2 possibly. My Chaeto in my fuge also was not growing well untill I raised the level of CO2 that my calcium reactor was putting out. Now I didnt raise the level to get the Chaeto to grow..I raised it to get the pH down in the reactor so the Mag chips I have in it would disolve. The by product of this was in few months the Chaeto tripled in volume.

But Chaeto not growing is not a issue in it self since most of us have it in the fuge as a way to export nutrients. So if its not growing then your nutrient level in the tank might be low, which is good.

My 2 cents
Jim Mc
Old 11/27/2007, 12:03 PM
lvreefer lvreefer is offline
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IMO, the caulerpa needs to go; it will rob the reef of calcium. As far as the cheato, a lot of factors besides lighting will affect the growth; flow, food, water chemistry, gas exchange…
share your knowlegde... might learn something
Old 11/27/2007, 02:03 PM
reef_enthusiast reef_enthusiast is offline
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do you dose iodine?

When I used to have my refugium online, I had the same problem you were having where my macro-algae was not doing well. My chaeto would be a faded green and wouldn't really grow. Then, when I started dosing lugol's solution, my chaeto did well. Was a dark green color and grew fast.

If you don't dose iodine, PLEASE BE CAREFUL 'cause that is something you do not want to over-dose. Do a search here or on google for "chaeto and iodine" and you will see a few good reads on the topic.

good luck...
Old 11/27/2007, 02:43 PM
awatson72 awatson72 is offline
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I would like to get rid of the caulerpa, but as poorly as it's doing, it's doing better than the cheato, so I'm not ready to ditch it yet.

I don't dose iodine.

What should the flow be like for the macroalgae? Light, moderate, vigorous? Is it highly sensitive to that, or should it do ok with different levels of flow?

I have a clear cover over part of the fuge, I'd find it hard to believe, but could that be enough to restrict proper gas exchange?
Old 11/27/2007, 08:30 PM
Marsfrogie Marsfrogie is offline
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Iron is a macroalgae nutrient. Also, you can try cutting off the protein skimmer and see if it grows faster. You may have very little "nutrient" to export.

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