Hello and help identifying

[Fidzero]

Well i have read these boards for about 6 months after i found out about them. You guys and gals are always very informative so i though some of you may be able to help me iding a couple of things in my tank. The two pictures called cc1 and cc2 are pictures of a candy coral i recently bought only to find when i got home that it had what looked to be aptasia on it, im wondering if it actually is aptasia or possibly something else? For now i have quarantined the candy coral. The other picture is of i crab i know its not a great one but honestly its the best i could get there are two of these guys which look like emerald crabs but are black in color. They like in a poros rock i have in my tank and rarley venture out. They seam to be reef, fish and invert safe as ive seen them with a pepermint shrimp just centimeters away and they didn't bother him at all but if anyone could get an id on these guys it would be much appriciated.