My torch coral has been looking a little wilted the past few weeks. Today I noticed one of the heads was dead with brown gunk on it. The Torch is located down stream from a small Zoe colony. I wonder if the Zoes could do some chemical warfare on the the Torch. I have a frog spawn and Elegance on the other side of the Zoe and they are both doing fine. The torch is in the corner of the tank. 36 Gal corner unit with one AI Vega. Maybe the light spectrum isn't strong enough in the corner? Params are all in check. Any ideas would be much appreciated.