Big Tex
Aquarium Advice Addict
Well, let's say they aren't infected with anything. You have to rule out your parameters, and your flow. There is nothing else. I'm telling you lighting is not the issue. I've kept zoas under all sorts of lighting and this is definitely not a symptom of low light.
Another thing I should mention just as a FYI, zoas are not low light corals. I don't know why everyone thinks this. They grow very close to the surface. They can survive in low light, but also can do well in high light situations.
The specifics are that you bought the colony when it was fully open, brought it home, and this is as open as it's gotten in 2 weeks, or it was fully open and over the course of 2 weeks it has partially closed up?
No its always been that way since I brought it home. So what could it be if not light or parasite?