Questions in Water Appearance

What to do when your water doesnt look like...well... clear water...

• I have had a tank running for over a year with no problem till now. It has had a white cloud for a couple days and is getting worse. I took the fish out and cleaned it all and now the fish are back and the white cloud is now starting again but not bad. What is it and what can I do?
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• My tank is fairly established for 6+ months but is now becoming yellow. I clean and do water changes, but the yellow is in the water. What can I do?
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