What is this coral?

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Well, it has receded slightly from the edge since I got it. I had some nitrates but fixed that. Not sure if I have too much light or not enough. Got 4 t5 bulbs over 20 long. 2 10k and 2 actinic.
 
Well, it has receded slightly from the edge since I got it. I had some nitrates but fixed that. Not sure if I have too much light or not enough. Got 4 t5 bulbs over 20 long. 2 10k and 2 actinic.

Oh I see the recession now. Nitrates were probably the cause. 4 bulbs should do fine for it, mine sits at the top of my tank under a kessil 150 and grows super fast. Here's mine

image-2330282749.jpg

It's in the middle of the rock
 
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