UV light doesn't seem to help with Algae

[sundance]

I installed a 9W UV sterilizer a week or two ago. I’m having a Algae problem. It’s a new tank but I was to get rid of it as soon as I can so I installed a UV light to help. It doesn’t seem to be doing anything. I don’t expect the algae to just disappear but I did think I would see the growth on the glass slow down. I assumed the UV would slow or stop the amount of water born algae there by stopping or slowing the reappearance of the algae on the glass after I clean it. I haven’t seen much of a slow down of the algae on the glass. Could this be because the flow is to high or is it more likely to little and not a fastest enough flow of the volume of the aquarium going past the UV light?
Thanks,
Stephen

 

[nerdy]

Sometimesalgae growth can be caused by poor lighting or high
phosphates.... UVsterilizers can't get rid of that problem,or at least I think that they can't