I have two 6055s and I finally added them to a VDM port on my Apex and programmed a wave. Now, when the pumps start up there is an audible click. Is there a new impeller that I should be looking to buy, or maybe a setting in the Apex that I over looked? I went off of another persons recommended settings and it doesn't appear that they have the same clicking noise going on.
Here are the settings I used: http://www.reefcentral.com/forums/showthread.php?t=1994312
Here are the settings I used: http://www.reefcentral.com/forums/showthread.php?t=1994312