There's a few ways to do it. Total balck out is one way, pH is another... just keep in mind that what ever you do is going to stess your live stock (blackout will stress the s*** out of SPS). Start with the less stressful and work your way up. Maybe start fresh or move your coral to a temporary tank while you battle dinoflaglettes like Mothra versus Godzilla so that your nice SPS don't get caught in the crossfire.
I know it's not a common method, but what helped me get right of mine was LOW aeration and, of all things, iodine. It seemed whenever I dosed a little bit with iodine the stuff would die back. Now, I'm not saying dump a whole ton of iodine in there. I'm just saying that's what I saw. I found from experience and from other people's observations that high aeration (ie. high CO2) promotes dino growth. Make sure your water level is right and that your pump, filter, whatever isn't dragging a ton of bubbles into the water.
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