About the same size as the picture, approx 2" across

Parameters
 

I'll PM you as I have just a couple questions about your tank conditions compared to mine. I was under the impression that Alveopora is hard to keep.

Haven't received a PM. You could be thinking about Goniopora? I can transfer these between tanks with different parameters and they don't mind much.

Liveaquaria lists them as Moderate
Here's an excerpt...
Being easier to care for than Goniopora, any of the Alveopora species make a good alternate for the novice reef aquarist, who is seeking a coral similar to the hard to maintain Goniopora.

Current parameters are
Nitrate 0
Phosphate 0.03
Calcium 410
Alk 9.4
Magnesium 1950 (on purpose and corals don't care)

And they must eat fish poop like all the rest cause they don't react to any sorts of foods

Hope that answers your questions :wink:

Conditions
 

Sorry for no PM got sidetracked.
I think lighting is the biggest issue for me and corals. i have 2 RadIon XR30Pros on my 120, set at about 80% max at peak. The soft corals I have mainly seem okay with this (the Montipora are an issue as I can't seem to make them happy and they brown out and degrade). What kind of lighting do you have?
ps I see a bright green Monti in the edge of one of your photos, looks way more happy than mine :(
Ken

No problemo
Lighting on the tank is custom LED and T5. That monti you see is the highest piece in the tank about 4" from the surface. I've always put the monti at the top and seems to like lots of light. Maybe yours isn't getting enough light?
Or maybe your parameters are off? Montis are considered moderate to keep as well so you might wanna figure out what's amiss