hey i have got a algae problam in my tank and i wanted to kill it off so i am thinking about useing this a UV pump witch kills off all algae also it says it kills bacteria to but don't i need the bacteria in my filter to keep my ammonia and nitrites at 0 ? http/www.ebay.co.uk/itm/1850L-H-Powerhead-5W-UV-Steriliser-Aquarium-Water-Pump-Fish-Tank-Boyu-SP-103UB-/180751981377?pt=UK_Pet_Supplies_Fish&hash=item2a15a85b41