well cloudy water can occur overnight without you evn knowing why, when you clean the filters out how do you clean them???? do you clean the filters pads out in a bucket of the aquarium water????? if you dont and you just clean them out in the shower for example then thats why you have got cloudy water, you should always clean them out in the aquarium water, i used to clean my filters out in normal tap water untill i think it was ofl mentiones it to me, ive got 3 filters in my 270 ltr tank and about 3 weeks ago i decided to cclean my filters out which i did so , but then i realised that ive cleaned out both pads in the 2 filters which is a big mistake ive been told buy nemerous ppl that u should only clean out 1 pad per filter to let the other pads bacteria move across to the other pad, sounds crazy but it is true , anyway like i was saying once i realise what i had done then the next day i had cloudy water, my water is a bit cloudy still but it is passing,
one more thing i would keep the feeding down to a minimal atleast untill the cloudy water passes
regards ashley1984:P