Depending upon your supplier's definition
you may get the attractive black and white harlequin and/or the also very nice orange tiger striped variety. Both are nocturnal and shy (as with all serpents) but in a month or so will know when it is feeding time and show up. The one advantage of the greens (Mr. Green Jeans is in his own tank at the moment) is that they do not seem to be as nocturnal if nocturanal at all and mine is out much of the time.
All of mine have been in a tank environment for at least a year (I think I have only lost one in four years and have seen tiny ones in the reef. The little ones are likely hitch hickers rather than tank bred but I don't know) and they are out before the food enters the tank. The ones in SueNami's tank are often patially seen during the day and will react as if hoping for food to the shadows of people approaching the tank. They are definitely one of my favorite clean-up crew critters.
In my group (I have 7 and now maybe 8 full time tanks of various sizes) all have some form of echinoderm, all the larger ones have serpents in addition to brittles, thorney's or common stars. Only the largest supports the commons though and then just barely. The thorney's (my very favorite) are not nocturnal, terrific scavengers, hardy and brightly colored but
not fully reef safe. They are excellent for a limited octopus environment but not the more typical reef of a cuttlefish home.