The calcium looks a bit low, but some lower light should help them to open up as well. Either way, they look like they'll open up perfectly if you just give them some time; the color's great.
Also make sure they aren't in super high flow. My acans seem to take any flow once they have adjusted to my tank but when I'm first acclimating I will make sure they are in low flow. Seems to convince them it's safe to come out!