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air in a daphnia tank

I am setting up three daphnia tanks and am wondering about air.  My 
intentions are to put a little circulation in.  Is there any advantage or 
disadvantage to using a foam filter?  What about an undergravel filter?  

I am doing a little experimenting and am going to set up one each of a bare 
tank, gravel tank and gravel tank with UGF.  Comments and experiences welcome.


Chuck Church
Indianapolis, Indiana USA