Undergravel Filters are the best filters!

There are several functional techniques for FW denitrification. Plants are the simplest, but plenums, Ehfisubstrat or similar microporous materials, coil denitrators, the old denitrification boxes (not sure those are still around), etc. are all valid techniques. Water changes are better and cheaper than any of those however, and remove all pollutants in solution equally - which none of the nitrate-specific processes do.
 
I wanted to do a RFUG, but it takes up extra space under the gravel and since my tank is only filled about 3.5 inches high with water it would not allow enough gravel to keep my plants in the water (push them up too high), Otherwise I would have to get some really short plants.

I'm sort of limited because it's a terrarium/aquarium, I can't simply raise the water level to compensate or it would flood over the land / water divider. I just threw 2 extra foam/spongest in the tank, one inside my wisper 10i, and another on top of a rock to which the wisper flows the water onto. This should give me alot of extra bio filtration and also prevent the wisper from braking up the water surface.

So in my case in a small aquarium I did not think it was a very good choice at all.

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I have a quick RFUGF question: does the height of the uplight tube matter when using a RFUGF? The pics I've seen of a powerhead setup for reverse-flow all so the powerhead attached to a short uplift tube.

Peace...
 
have a quick RFUGF question: does the height of the uplight tube matter when using a RFUGF? The pics I've seen of a powerhead setup for reverse-flow all so the powerhead attached to a short uplift tube.


As far as function of the filter it matters very little if any at all. I usually set my powerheads as low in the tank as I can so they do not get filled with air when I do water changes. If I can keep them below the 50% mark I am very happy. The height of the intake sponge is the deciding factor for the low end of the spectrum anything in between will work for me. I have run RFUG with the powerheads all the way to the top, but each time you do a water change you have to purge air from the powerhead when you re-start. It does not seem all that big of a deal at first but after a while it becomes a PITA!!!
Dave
 
daveedka said:
I usually set my powerheads as low in the tank as I can so they do not get filled with air when I do water changes.
Great point. Do you hide the power cord with decorations, etc?

Thanks!

Peace...
 
tomdkat said:
Great point. Do you hide the power cord with decorations, etc?

Thanks!

Peace...


or a background. I need to put one on my 55g, should have done it before I filled it, but lazyness got the best of me...or worst. :rolleyes:
 
Great point. Do you hide the power cord with decorations, etc?

Generally yes. I try to make any equipment in the tank obscure. I am not extremely good at hiding things with Aquascaping, but those who are don't seem to have too much trouble.
Dave
 
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