A paste or slurry made of Kalk powder (pickling lime). Needs a methode of pinpoint delivery (like a syringe) as it has an extremely high pH and will burn anything it comes in contact with in your aquarium. The small amount used to kill aptasia will eventually diffuse just adding more Ca+ to your aquarium water.bkelley02 said:Ignorance here but what is Kalk paste? I've heard of using Joe's Juice for getting rid of them, but not Kalk paste.