Hi,
I have a 125 gal reef with 150 lbs rock and a 3-4 inch sand bed ,
it has been running for about 6 weeks . I have noticed some black areas in
the sand it doesn't seem to smell of hydrogen sulfide , is there a problem ?
the tank is going through usual cycling stuff algae etc. I'm changing about
45 gals of water weekly and tangs snails and crabs seem to be doing there
thing . Any help will be appreaciated.
Thank you
Charlie
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