Is there anything else in the tank that you want to survive? You can boost your Ca up to about 650 for 24-48 hrs and it should kill most or all of your coral off. Leave it for 72 hrs and it should kill it all off. If you're not so keen on this the kalk paste works wonders, I use it to kill off coral spawn in my DT from one of my birds nests that spawns regularly. If you have large areas the kalk paste might take forever as u can only dose a bit at a time. Perhaps take a few pieces of pantyhose and wrapping it around the coral spots to block both light and flow for a few days... there must be something better than pantyhose though, anyone have ideas?
Dan
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