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Old 12-21-2006, 02:31 PM   #11
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Since it is an overflow, more water will not come out if the water line is below the overflow setting. So, no water will come out.....,...
that is depending on your setup...

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Old 12-21-2006, 02:47 PM   #12
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Well, if you have the intake in the 30G and the output in the main tank, it has nothing to do with the overflow. The overflow is just for the water going from the main tank back to the refugium. So if the power were cut off, the water in the canister would create a back siphon until there is a break in the output tube in the tank. That means that the water in the main tank will drain off to the point where the output is. Now if the output was above the waterline, that wouldn't be a problem then.

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Old 12-21-2006, 06:55 PM   #13
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I see what you mean...
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Old 01-01-2007, 09:31 AM   #14
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Also, I would worry about the flow rate. External cannisters don't really deal with head as they are taking water from the same height as they are returning it and thus hitting a near equilibrium. I do not think the same flow rate would be achieved when pumping from a lower area to a higher one.

Also, as mentioned you would have to worry about back-syphon when the power is out. And while the FX5 is supposed to automatically set up the syphon, that is usually with the water coming in from at least a few feet higher. I doubt it is designed to work with water at a similar level.

You would be better off using a proper return pump and saving the FX5 for flow rate, or even create a non lit fuge in the FX5. Fill it with LR rubble (and any chemical media you want to run) and you should still get some benefit from it.

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