Soprano zoa placement

[mike61289]

I just purchased a frag of 3.5 (1 growing in) soprano zoas. They have been on my sandbed for a week. My turbo snails started ramming themselves over their plug and knocking it upside down. I decided to move the plug onto the rockwork 2 days ago where I keep my other zoas and palys to avoid the snail ramming. Since then, 2/4 polyps have been closed. I moved them back to the sandbed yesterday with the hope that they would open again. Same 2 polyps are still open.

Any recommendations on the best placement for them in terms of light and flow? Thanks.