Recently noticed that there is small air bubbles coming out the output. Last night I took the media trays out and cleaned the bottom for all the lose quartz that was in there. It seemed to stop the bubbles but when I returned home a minutes ago, it's doing it again. I don't know if this has anything to do with it but I can hear water splashin around inside the filter and I don't think it was happening before, if it was it definitely wasn't as loud.
Any info on why this is happening or on how to fix it will be helpful!