Try this as a test:
Take your Zoa and raise it up closer to the light. Get a long piece of PVC tubing, stand it upright in the sand and place the Zoa on the top so that its 6 inches from the light and see if it opens.
I am inclined to think the lighting is inadequate and why it doesn't open. But remember that it could be more than just a lack of lighting.
Take your Zoa and raise it up closer to the light. Get a long piece of PVC tubing, stand it upright in the sand and place the Zoa on the top so that its 6 inches from the light and see if it opens.
I am inclined to think the lighting is inadequate and why it doesn't open. But remember that it could be more than just a lack of lighting.

