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- Good afternoon. I have questions on transitioning from a stocked 10g aquarium to a 20g (tall) one. I plan on using the oversize filter that is on my 10g on the new tank. Would I be able to add 5gallons of water to the new tank and cycle between the two tanks adding a gallon of water every other day until I had enough water to fill the 20g, and then transfer the fish? Assuming both tanks were heated appropriately and had filters running, I plan on reusing the gravel in the new tank as well. I can put the original 10g filter back on one of the tanks.
Seems like it should work, rather than replacing water in the existing tank, I’m just adding water and capacity.
I appreciate the feedback.