What Coral Is This

Hi! Welcome to Fishlore!! I too have a 20L reef tank and I'd love to see more of yours.

It's hard to be sure but it certainly could be a type of montipora. Would you please share a picture with the blues turned down? The white lights aren't always the most flattering but they are the most revealing and make for the easiest ID's.

I don't know of a white coral... and the pic just isn't revealing enough for me to see how much polyp extension it's showing, so I can't really make a judgment call on the health (or what we often refer to as the mood of the coral, i.e. is it happy or mad?) I do have a montipora myself that is blue on the edges with a very pale green coloration inside and red polyps, known as a Jedi Mind Trick... perhaps you could Google a picture and compare it to what you see. You might also want to look at montipora capricornis, (or monti caps/plating montis), or maybe I'm way off. Maybe a cyphastrea that's a little mad? To be quite honest, the polyp extension doesn't look great in the pic above, but that can be totally normal for a new coral... and even an old one. I've got a few that pout now and then for no apparent reason at all, one of which is another coral you might like to look at for an ID. Maybe it's porites. A whiter pic will help.

 

It can be pretty tough to be 100% from pictures, but I do think you've got a montipora coral there and it does appear to have a softer look, kinda like the Jedi Mind Trick variety, so I'd hazard a guess that you have an encrusting monti rather than a plating monti.