If you have alot of rocks then it's do-able depending on what you get. I have had 2 emerald crabs in my tank for over 5 yrs now both with clown trigger and huma huma trigger.
Thank you,Rickross and sip tang.I used to have a humu humu with some hermit crabs,but do not recall whether he had them or my harlequin tusk did. Anyway,thank you both. I am really enjoying this forum.