Green Water

[Cultasso]

Ive had a tank set up for bout 6 months and ive never had this problem, however after my last water change the water has gone green so I cant see anything hardly. The Fish seem quiote happy but it looks nasty, any ideas what I can do. I didf also wring out the filter pads when i Did last change

 

[celaeno]

this problem is quite common. i'd get a uv sterilizer. ever since i got an internal uv sterilizer for my tank, the water has been clear.