March 18, 2009
I'd give it a month if you're running both together, and ideally reduce the flow each week in the old filter so that the new one is doing more and more of the work.
But if you can fit the existing filter media into the U2 then you'd be fine with just that on its own.
June 13, 2011
August 31, 2009
I have read the yards and yards of information on bacteria build up in filters etc. This is all new to me after a 40 year break from keeping tropical fish.
Everything in my tanks comes from the Lake. Gravel, rocks, plants and water. My tap water is untreated Lake water. Do I have to worry about biological buildup in my filters? I normally rinse the sponges when I change the cottonwool pads.
The bacteria are needed to break down the ammonia produced by the fish to first nitrIte and then to nitrAte. This is then used by any plants present and can be removed by regular water changes.
As long as you rinse the filter media in old tank water and then only enough to avoid any obstruction to the flow it will be fine.
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