[stevem]

first off you do not say how long it is setup, second are there any fish in there and last why crush coral, are you setting up a high ph tank?
Most new tanks go through what is called new tank syndrome. It is when bacteria starts to grow and is normal.
There is not enough bacteria at the beginning. Once thier is it should clear up.
I need a little more info to give you more of an answer.
What type of fish do you intend to put in.