You can use a sponge filter with an air pump if you would like one, it wont harm anything so-long as the water is just trickling back in slow so as not to knock the shrimp around.
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These work very well in shrimp tanks and should be baby safe too, they also come as a double sponge too. If you are not familiar with these they require a few bits like small air pump, a one way valve and adjustable tap which are not too expensive.
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