I've done this and it seemed to work ok. I did use a large sponge as a prefilter after the overflow, but before the canister filter. dave -----Original Message----- From: Simon, Dan [mailto:Dan.Simon@pcgw.claircom.com] Sent: Thursday, March 07, 2002 8:17 AM To: gsas-member@thekrib.com Subject: equipment question I was thinking about buying a commercial skimmer/overflow box and run it straight down to my Fluval 404 canister filter. Any thoughts or speculation as to the outcome? Dan