proclear wet/dry making constant gurgling noise
I have a 75 gallon saltwater fish only and just recently replaced the entire wet/dry filter system. It has been up and running for about a month, and all is good, I love it, but lately it has been making a "pulsating" sound in the tube that goes down to the filter. (sorry I am not up on the correct terms but wish I were). I have had this tank for about 6 years and only know the basics. I could really use some help determining why this pulsating noise is all of a sudden happening. When I move the tube a little back and forth, sort of "jiggle" it, it then makes a different noise and sounds like a storm drain right after a heavy rain. When I look below at the filter system, the water sometimes spits out heavier than normal.
Can someone please help? Am I not doing something right?