Bump is just a word to make your submittion go to the top of the list.
If you are in the main index, to the right you will see "view post since last visit"....that's all the latest stuff. If noone answers you, your post will end up at the bottom or on another page and most likely will not be answered. You post "bump" and it will be back at the top of the page.
If not, read the recent thread "crab id, can I keep 'em, mommy??? (first reef lol)?" because it has the same crab and ID info.
I posted some pics of mine there too.