Hi..I am a new betta owner and I don't have a filter setup like you, but I recently posted about cloudy water only one day after completely cleaning the bowl. I was told it was a bacterial bloom and not to worry about it, it would clear up after a few days. Yesterday was the day after the cleaning. Before I went to bed, I did a partial water change of about 1/3 of the water. This morning the water is clear. I don't know if it would have cleared without the water change, but I just worried about it so I changed it! Good luck to you!