Neither. It’s cycloseris
I only grow them on plugs. Mama is on a plug on a frag shelf.
It’s very risky. This isn’t like other plates. I don’t want to post methods because i can’t be accountable if others lose theirs following my advice. What I will say is…
1) Don’t try it unless very experienced or willing to risk a tremendous loss
2) they only reproduce by budding
3) this plate only produces buds as a survival tactic if it die’s, or becomes physically damaged to the point where it is near dying.
I believe the difficulty propagating combined with the crazy and stunning appearance, are why the price is so high. It’s not an easy thing to get to propagate…you risk losing it. There’s no documentation on how to do it. if yours dies…keep it. There is a chance it will make buds approx 1-6 months after “death”
I have a lot of experience with plates. And for the first few years I had the same experience as you.
What I’ve learned is - don’t put them in sand. Most lps and corals don’t like to touch sand. It’s like microscopic shards of glass which doesn’t go well with soft fleshy tissue.
Plates will expand and contract as shown with my mama pics, and if they rub on sand, they get erosion, tiny cuts, infections. It just happens in time
I avoid it completely, no sand. Keep on a rack, shelf, or my fav, a eco rock frag mount which will grow it in a dome shape like a volcano, and buy you 2 years to figure something out (grow out tile / disk)
Plate corals grow larger by making a skeletal base that grows along the surface they sit on. Most put them on the ground and grow flat plates. Not me. I put on a plug to elevate and find they encrust and grow over the plug and then down along towards the ground. Leave it on eco rock stand and you will have a volcano shaped plate instead of a flat one ;). If you want a flat one, leave it on a frag shelf or tile
They also love to eat. 2-3x a week. If fed mysis or pellets this schedule, it will be double size in approx 6-8 months.
Mine doesn’t seem to mind flow, low-high I’ve grown them in all. Par should be low to medium - 50-125ish. I grow them on sandbed level and mama is mid level on a shelf