I recently purchased the contents of a 75 gal marine tank and had everything transferred to my 90 gal tank. I have years of experience with tropical but we recently moved to GA and I wanted to start something new. Why is my white sand turning brown. Please tell me what to do. I have an exotic fish store very close by but since I don't have the technical words on the tip of my lips I feel they are looking at me like I am a stupid yankee...and possibly I am but I love my marine tank. Have 7 fish. Tang, purple trigger, 2 bassletts red hawk eye, tomato clown. Need your professional help quick. Thanks, Bubba
