start doing water changes, atleast 10-15 gal on a 55 gal tank. repeat this every week until it clears up.
You have to tell more about your tank for more of an answer.
What kind if filter,what kind of flow,your lighting period, how many watts, even what you have in the tank(coral, fish,cleanup crew, snails, hermit )let us know so we can help more. keep a light hand feeding, I even skip a day a week of no feeding.
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