Hello, over the past few days my tank has gotten cloudy. I was wondering how do I prevent this. I have a low current filtered, heated and unplanted 30L tank with my male betta. I did a 25% water change 2 days ago and did not notice a difference after, the cloudiness has gotten progressively worse since then. I also have a layer, of what I'm assuming is biofilm on my glass and ornaments which is producing white flakes/specs when wiping off. I have heard air pumps are good for this due to water movement? Any tips are appreciated, the photos are taken 6 days apart.