My 26 gl salt water tank has been up and running for 3 weeks now. The water is very clear but I have tiny bubbles or salt particles floating around in the top 10 inch of the water. I have a penguin 200 filter and a petco power head for 40-60 gl. I have removed the air hose from the PH and it helped some, but I still have air bubbles or particles floating around. The bottom half of the tank has no bubbles. Any idea?