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Do you know the wattage of your Coralife & Size of your aquarium?
Yes, Colored gravel will do if you have good enough lighting. I recommend Root Tabs and / or Flourish Excel liquid fertilizer for the first few months.
I am not at my house, so I am not sure of the wattage. My aquarium is 35 gallons. Thank you very much, you have saved me a trip and probably a lot of money (I was going to take out my substrate).