If you are talking about the
Montipora capricornus plate coral they are one of the easier of the SPS coral to keep. The grow pretty fast and don't need the intense lighting other high end SPS need.
The Ecsenius bimaculatus is a wonderful little fish. I have the tailspot Ecsenius stigmatura which is about the same. They are herbivorous and will feed off of algae in the tank, algae sheets and should be fed a food containing marine and blue-green algae. Great fish IMO just be sure you have some type of top to keep it in.
On the porcelain crab here is a little info from reefkeeping magazine.
"Neopetrolisthes spp. are most often found in association with anemones, especially those from the genus Stichodactyla, and usually share their host with anemonefish; while other species in the family are found in association with various corals and soft corals. Other genera within the family are not often found living in association with symbiotic partners. While porcelain crabs are not difficult to keep, those that associate with anemones should be avoided by inexperienced aquarists due to the difficulty in keeping many host anemones."
Seems like if you want one you should really get some more information on them before committing.
Hope that helps a little.
Here is a pic of my Tailspot blenny chillin in the Ricordea.