Need a little more info, such as the make & model of the 2 filters, and the bioload on the 2 tanks. Let's say, for example, your 29 has 3 identical small filters, and 15 1" fish. You could take 1 filter & 5 fish, and set up the 10 with 5 gallons of water from the 29 & 5 gallons of fresh dechlored water. I do it all the time.