Try Muriatic Acid. $9.00 fora litre of it found in paint department Canadian Tire. Put a bit into pipette or syringe, turn off circ pimps, and squirt a bit on them. THAT STUFF IS BLOODY AMAZING and did not set off tank chemistry even the tiniest little bit.
It will kill anything it hits but dilutes very quickly but be careful. If it does get on a coral it will only kill spot it hits, not whole colony death.
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Cheers
Gary
604-319-0317
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