Cup Coral (turbinaria)

[mark]

Got a Cup Coral about a week ago. It's placed on the floor of the tank and sits between 2x250W MH. Tank gets 30+ times flow and would say is placed in a low-moderate area. Picture was taken about 2 hours after the MH go off and under 2x54W T5 actinics. I'm getting slight polyp extension but nothing like shown in this peltata (more like this reniformis (fourth pic) but don't think that's what I have)

Though first link is T. Peltata, should I be expecting more from mine, if so how?

[mark]

Here's full picture. T frondes or T reniformis?

[Doug]

I would say its a reniformis. Peltata or pagoda coral, is more of a closed shape. My reniformis is a different shape than yours but perhaps as its still smaller.

I once had a large colony, that was similar to the picture.