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Air in Canister Filter

Just curious if anyone using a canister filter notices air trapped in
it.  I use a Magnum 350 on a 100gal planted tank, and air usually fills
the top 1/4-1/2" during the morning (and 1"-1&3/4" in the evening).

Any ideas what is the cause or how to prevent it?  Curious what you all


pearlsco at u_washington.edu
How much does a fish need a bicycle like a man needs... ?