I am just cycling a 29 gallon eclipse at the moment and wanted to change my substrate to Fluorite so I unplugged my filter, changed my substrate, and turned it on only to hear a strange noise coming from the filter. The motor works and everything, it just is not sucking the water up through the intake. It isnt clogged being that it has only been up and running for three days now. I was wondering if this was a common problem with an easy fix or not. Thanks in advance!