I have a 30 gallon reef tank. the water at the top is like milky why?

Answers:
who's been dippin' in the tank?

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Milky as in their is a film at the top? It is an oil build up. Placing a paper towel on the top of the water colum will absorb it in.

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need a better filter system i had the same problem

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You need a protein skimmer.

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you might be using too much calcium or kalk

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not enough surface agitation. a powerhead that is positioned to cause the surface to move can help and you need to adjust (or get) a protein skimmer.

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probably cause the tank is dirty

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the water is still
u need to add air Bibles to keep the water mowing or you re filter is not working property