Try running some carbon in your filter. Ususally works in clearing up the water. The UV kills all free floating bacteria/cells. So microscopic, you will not see with the
[hr]
eye. I use on my system, and I believe it helps. I run a 18 watt gamma unit.
But my reccomendation that is the most inexpensive is the carbon. some filters have pads with them already in it, some have to be placed in. Depending on your system, I'd try that 1st.
JM .02