Probably you changed the sponge in the filter to a newer one. It happened to me last month and I had cloudy like water for a few weeks plus outbreak of white spots in my discus and neon tetra disease in all my cardinal tetras of 50. They all long dead then. My discus survived the white spots with some traditional proper treatment (heater and sea salt combo, plus "ginseng tonic" for them). I was using an Eheim HOF, then I changed to my old trusty Eheim 2217 which I was using it 20 years ago! Had the old sponges in it and I use them. The water becomes crystal clear once again. By changing new sponge, or cleaning up your filter entirely, you are removing the good bacteria that you need in your aquarium. So it means you need to use some old sponges back in your filter (which had already gone through the cycling period). Change water would not change much about the situation. Try adding some carbon compound in your filter as well. It works. I am using this in my two feet tank.
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