So I have an fluval fx5 installed on my tank and it worked great with no issues for the longest time. Then all of a sudden one day it started having really low flow issues. I had given it a clean a month prior to this and didn't think debris build up could be an issue as everything was cleaned out pretty recently. I tried turning the power off and on too see if maybe it would expel some air. No luck. So I opened it up again and rang out all the sponges and media stuff again and turned it back on. Flow was back! Then two days later same issue. Any tips for what to do at this point? Do I need to replace some of the sponges maybe? Is something else wrong with it? Any help would be very appreciated.