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Old 06-05-2014, 08:11 PM   #71
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Here is a link that may give you some more info on why slow flow rate in fuge is desirable. However, a small circulating pump inside the fuge will help algae flourish. The idea is to have more dwell time for effective nitrate absorption.

http://www.thereeftank.com/forums/f6...low-24925.html
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Old 06-08-2014, 08:58 AM   #72
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it's desirable to the guys who are for it, but there is absolutely no data that proves it's better. Plants don't need dwell time. As long as they are in contact with water they will pull what they need. It makes no difference if a plant pulls all nutrients from a quart of water or a little nutrients from 100 gallons a quart at a time, as it passes by.
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Old 06-08-2014, 12:32 PM   #73
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Quote:
Originally Posted by mr_X View Post
As long as they are in contact with water they will pull what they need.
I totally agree with that statement only if all the water going in pass completely through all the macro algae inside the container. If not then the potential is not fully utilized. It depends on how the fuge is setup. If the intake is at the same level as the overflow then most of the water will just pass straight out leaving the bottom stagnant. This is the reason why the plants (algae) flourish if you have small circulating pump to stir it up a little bit.

The other reason of having low flow in a fuge is if you plan to culture copepods as stated from this link.

"Prior studies had showed that even a small amount of turbulence can affect a copepod’s ability to feed and grow and Bickel and her colleagues postulated that the sudden and intense turbulence created by a boat could harm or even kill copepods."

Reef aquarium copepod, will it blend?
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Old 06-08-2014, 12:33 PM   #74
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deleted double post due to connection problem
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Old 06-08-2014, 07:10 PM   #75
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Interesting article. I wonder about pollution over turbulence (many boat motors have their exhaust pipes under water), but that said, do you really think that a reasonable return pump has enough power to mimic a boat motor in water? I have always used my return pump full blast through my sumps, and haven't seen any lack of anything, especially algae.
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Old 06-08-2014, 08:48 PM   #76
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I am referring to the fuge not the sump. Of course everyone knows that you can have flow in the sump as much as you want but not the fuge. Sump and fuge have each with specific function. Refugium primary purpose is to cultivate pods and the algae is just secondary.
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Old 06-08-2014, 10:06 PM   #77
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I am referring to the fuge not the sump. Of course everyone knows that you can have flow in the sump as much as you want but not the fuge. Sump and fuge have each with specific function. Refugium primary purpose is to cultivate pods and the algae is just secondary.

The refugiums primary purpose isn't to cultivate pods, nor is the algae secondary.
The primary reason for a refugium is to export nutrients naturally... Which is why the algae is in there.
A refugium is just a good place too cultivate pods.
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Old 06-08-2014, 10:42 PM   #78
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No need to argue about refugium if you can read this.

Purpose of Refugium
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Old 06-09-2014, 04:10 AM   #79
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ónoun, plural re∑fu∑gi∑a .

an area where special environmental circumstances have enabled a species or a community of species to survive after extinction in surrounding areas.


Carry on. It can also hold algae.
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Old 06-09-2014, 08:12 AM   #80
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Cycling And Lights

"A refugium may be used for one or more purposes such as denitrification, nutrient export, plankton production, circulation, surface agitation, oxygenation or aesthetic purposes."
There are any purposes, but they aren't made specifically to cultivate pods either. They are good for many other things too.
EDIT: Just another point,
Do you think the pods are as happy without the algae? Just, a thought....
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