I have orange digis, also growing well, but they do need a lot of light. When I found a neighboring SPS start shading one, that portion would die off.
I did try Zoas about a year ago, a couple times. But they all melted on me. Even moved them to a separate frag tank, but no luck. I took a frag back to the LFS (Paul's place) where it was examined for possible pests, but none found. So I have given up on them, for now.
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