The corals are. I have a beautiful catalaphyllia but unfortunately not long before finding these forums/podcasts 3/4 of it died off. It was heartbreaking. I later found two dead rotting snails in my overflow. Fish would sometimes end up there too but I have put gutter guard there now. Works a treat. I can only guess that the catalaphyllia died from my already high
nitrates levels going "over the edge" from the dead snails. Since getting rid of them my Corals have opened up more. Since getting rid of my bioballs and cannister filter they are even happier!
