hi i have been keeping fish for roughly ten years and have never come across this issue. i have a 130 gallon tank. it was a set up to house my old s. american cichlids. they were in there for 5 weeks no problem, all ok. i have just got rid of them and put a group of fronts in there and the water has gone so cloudy you can barely see them. it is like a big white cloud in there but from some angles it is green. i have tried water changes every 2-3 days but nothing is working. any help will be great. sorry if i sound stupid and there is a easy explanation