You want to use sand because crushed coral will trap food and fish waste because of it`s size ans weight and cause excessive nutrients that will lead to nuisance algea. Your clean up crew will have an easier time with sand.
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Depends on what type of corals you are talking about. Watts is a bit old school but we still use it as a broad guideline. Intensity is what you are looking for as far as lighting. But as said it really depends on what corals and anenomes you want. If you got T5HO`s or MH`s then you would be covered as far as intensity.
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