Been running this hob filter in a 16gallon for over a couple years, last few months the suctions gotten very bad. I would clean monthly but the last two months no matter how hard I scrub the impeller and it’s little station it doesn’t seem to be getting better. In fact it’s at it worst state right now, I can’t even turn it on high suction without it sucking up all the water and makes loud gasping noises. I’ve also had the same filter media since the beginning only changing the activated carbon. Any tips or is it time to