I think your little crab will be just fine.....after all acro crabs live deep inside the coral for one main reason......protection.....I had several acro crabs before my crash(and a couple now) in with a neon DB and a LARGE mystery wrasse.....besides most of the fish we have mentioned are more of a threat to shrimp then crabs......
beautiful pics BTW
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260g mixed reef, 105g sump, water blaster 7000 return, Bubble King SM 300 skimmer, Aqua Controller Jr, 4 radions, 3 Tunze 6055s,1 tunze 6065, 2 Vortech MP40s, Vortech MP20, Tunze ATO, GHL SA2 doser, 2 TLF reactors (1 carbon, 1 rowa).
http://www.canreef.com/vbulletin/showthread.php?t=50034 . Tank Video here
http://www.vimeo.com/2304609 and here
http://www.vimeo.com/16591694