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Hello I am new to the site but not to keeping planted aquariums. I recently moved and this gave me motivation to set up a new tank. All my old tanks have used canister filters but I am thinking of using a overflow that will run into a fw refugium that will include a reverse flow ug filter. I really like this idea as to hide the co2 system, heaters, and filters, put am a little concerned about its application in a planted tank. Will all this circulation and generating the co2 in the refugium effect the co2 levels in the main tank. Also I would like to do a moss wall but am a little worried about the moss getting sucked into the overflow and clogging it. Any thoughts?
I personally would not do a planted tank with an overflow and especially an UG filter. The trickle filter will gas out a huge amount of CO2 and the UG will limit root growth, and be a trap for bacteria.
 

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...I've also heard that that is a myth about ugs and planted aquariums. Also isn't the whole point of a ug to trap bacteria? :) I know ugs get a bad rap but i have never been anything but successful with them.
With regards to UG filters, I think it was a popular piece of equipment in the past, but there's a really good article that details the bad side of these filters here... http://www.aquaworldaquarium.com/Articles/TonyGriffitts/silent_killer.htm

As for trapping bacteria in the gravel, there's a huge difference between bad bacteria (anaerobic bacteria) and good (nitrifying bacteria).
 
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