Ya, get that RO sorted out so that you're getting less than 2 ppm tds.
Get some sand sifters for your sand. An Orange Lip Conch or a Fighting Conch would be a good choice for a 45g tank. Sounds like trapped sulphurous areas in the sandbed. You can fix it by stirring the sand yourself, but only do a 2x2x2" patch each day. Release too much in one go and you'll poison your tank. The black patches will stink too.
You definately have excess nutrients in the tank, so take a good look at what's going in there.
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~ Mindy
SPS fanatic.
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