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if you want water movement these are about an inch and half by an inch and a half and adjustable, azoo 180.
http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+4586+4591&pcatid=4591&r=485
http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+4586+4591&pcatid=4591&r=485