Since setting up my aquarium I have been bothered by the haziness of the water, sometimes it seems worse than other times, but it always seems to have a slight haze. I have also observed that algae, brown and green, seem to grow and spread very quickly. I have used a UV Sterilizer in the past, a Coralife Turbo Twist 12X 37 watt – the older model, I bought it 2010. I wasn’t sure if I wanted to use it in this setup. I wasn’t sure if it would really make a difference or not. I decided that I would put it in-line. I put it in-line after the Fluval FX5, and before the second in-line heater. After 24 hours, I was surprised at the difference that it made. The water cleared up very nicely.