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Old 11-23-2009, 06:10 PM   #11
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Thanks. I wouldn't think they'd work as well with a sand substrate and it seems like it would take longer to get the tank cycled if using a UGF than a more 'highly regarded' filter but I'm still standing by "it's better for the residents than nothing at all".
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Old 11-23-2009, 06:16 PM   #12
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yep, cant use them with sand, but ive heard that they will cycle a tank faster, at least thats what a couple people on here have said. i dont like the concept though, and have heard too many stories of the junk that builds up under them
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Old 11-23-2009, 06:27 PM   #13
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A ugf does build gunk, I have mine on double reverse flow soon to be 4x reverse flow, The tank water smells better then the tap water does.

Ive seen some UGF systems that were years old that were surprisingly clean for their age, most part due to extremely disciplined tank cleanings and strict feeding amounts.
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Old 11-23-2009, 06:30 PM   #14
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are you pushing up through the gravel then? sounds like that would definately help with the "gunk" buildup
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Old 11-23-2009, 06:36 PM   #15
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Yes, Mine pumps from the tank down the tubes via powerheads w/ marineland reverse flow kits. everything floats about an inch or two above the gravel line then goes up into the filter and starts all over again.

My corydoras have adapted well to not being bottom feeders.
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Old 11-24-2009, 09:39 AM   #16
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does the gravel look like is is along a volcanic rift, moving? I would imagine you get the most flow closest to the down tube and relatively little at a distance. Unless you have multiple downtubes and multiple powerheads.
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Old 11-24-2009, 10:33 AM   #17
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multiples here but yes there is a constant erosion process at the plate......combated with chunk rock. however I use flourite and its very light weight material.
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Old 11-24-2009, 04:53 PM   #18
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Wow...I did not know there was so much banter on weather to use an UGF or not.
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