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Really until there is enough room for it grow or it starts dying. The more the merrier. Something you can do is add the excess to your DT and it can remove more nitrates faster.How often should I be pruning my chaeto? I started with about a baseball's worth. Now I probably have a 5 gallon bucket and change worth. It's in a 20 gallon dedicated tank so still lots of room to grow (especially downward)