01-05-2011, 03:20 AM
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If you are wanting to keep the smaller tank running (quarantine good idea)), then so long as you don't remove more than 50 percent of the filter material ,what you are planning should work. If your not going to keep both tanks running,then I too would let both filters run on the new larger tank for a couple three weeks and then remove the smaller one.
Just be sure to add any new fish slowly ,and a few at a time to the new larger tank to allow bacteria to gradually increase with the gradual increase in numbers of fish.
Were it me,,I would try and keep the smaller tank running if new fishes are being considered for the larger tank. Would be sure and add a few fishes to the larger tank at the same time that I added the borrowed filter material or gravel to provide food source for the bacteria that you transferred. If new fishes are being considered ,I would leave a few fish in the smaller tank until i purchased a few new fish and then remove the few fishes from the smaller tank to the new larger tank and place the new fishes in the old tank as quarantine (wise). Hope this makes sense, Whenever bacteria is alive,,it needs a food soiurce (fish food ,or fish waste) or withinn 24 hours,,it will begin to die off depending on water conditions ,and the amount of bacteria present.