Hi guys ive got a 190ltr fairly heavy planted tank, been up and runnig for around 3 months. currantly useing pressurised co2 and dosing with leaf zone once a week when doing a 25% water change and have a 1500ltr per hour pump for circulation. all going fine and well plants growing like wild but the surface of the water has developed a film with green particals on it witch i asume is algae, it sticks to every thing that passes through it. the water colume is crystal clear. any one got any ideas what it is and how to get rid.