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I have a 55 gallon tank that was fishless-cycled and has been running with fish (about 20 mbuna) for about 9 months. I am having issues with cloudy water that started about this time last week. I tested for, and got 0 ppm for both ammonia and nitrites. (API Freshwater Master Kit).

I typically do about a 60-70% water change once per week. Nitrates right before water changes are usually around 30 ppm and drop to about 5 ppm post w/c. The only thing that have changed is that I started using an airstone at the back of the tank about 2 weeks ago, and I have noticed a thick white to translucent slime growing on the polyfil and filter media. I use the polyfil to control particulates and I change it with each water change.

Anyone have any suggestions? How do I fix both the cloudy water and the slime? I'm guessing it is bacterial bloom, but I'm not sure. Any advice or suggestions will be greatly appreciated; thanks in advance.
 
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