The Planted Tank Forum - View Single Post - How do you all agitate your surface in your nano tanks?
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post #12 of (permalink) Old 11-21-2012, 03:21 PM
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Join Date: Apr 2011
Location: Durham, NC
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Originally Posted by sayurasem View Post
Lily pipes are designed to make a little swirl on the water surface to get rid of surface scum.
Unless you have a massive amount of outlet pressure when using the recommended pipes, you're not going to see much of a swirl. I get a decent surface ripple in my 20L with a 2215 with 13mm lily pipes. The only noticeable one I've seen was in a well-known 60-F thread on here in which there was an Eheim 2215 attached to 9mm pipes. Normally you would would use 13mm pipes for that filter outflow. Concentrated flow = whirlpool.
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