Just thought id put the word out this i bought a new filter AQUA ONE CF-2400 , i couldn't believe the difference it made just in half a day, i have 2 Oscars in a 200 litre tank (i know its small, getting 6 foot tank in FEB), it churns out 2400 litres in an hour and that pretty much cycles my whole tank 12 times in an hour, the water is crystal its unbelievable, and its really really quite, i would highly recommend this filter, anyone else have the same filter ??