Hi all im realatively new to this forum & would like some advice on how to get rid of water fleas my sump tank has become infested with them as has the media/bio balls & i dont want them getting into the main tank,i keep mostly malawi,s along with the odd oddball, the sump is a secondary filter used as a biological system along with a fluval fx 5 as mecanical i intend to increase the flow rate on my sump as at them moment it is only about 5/600 litres an hour,any help would be appreciated Steve