sand

Hello! I am new to this hobby, and I will be converting a 150 gallon tank from fresh water to salt water. It is a beautiful clean tank and already drilled for saltwater. First. The tank has black sand in it from Hawaii. Can this sand be utilized for a saltwater set up? What do I need to do to...

Hi guys, The sand in my tank is starting to get a little PINK ?? Is it a bad thing? I tried to take a picture... it doesn't appear to be so pink but it's pinker than on the picture! here it is! Hope to hear from you soon! thanks in advance!