Rob's correct. temperature, current, and tankmates are the biggest reasons
SH won't do well in a reef. lighting isn't as much of an issue as long as there are dimmer places for the
SH to get out of the "sun".
SH really do best in a system designed with them in mind.
i'm guessing the tank in your siggy is the reef in question, and altho the pic is small, i can see a nice big Plerogyra in the center. bubble corals (and most other LPS) are definitely NOT
SH-friendly.
SH have been known to die from even an appie sting if it's severe enuff. clams are off the list as they've been known to snap shut on
SH tails as they try to hitch or simply drag them across the clam's mantle.
on to the single/pair question...there's no doubt that
SH are social critters and tend to do better with "company". that being said, if conditions are right, a male-female pair can breed as often as every two weeks or so, so you'll either be raising a lot of fry (or attempting to, cuz it's tuff), or you can look into a same sex tank, which also sometimes have their own sets of problems:
males can develop pouch emphysema, which requires you to perform a pouch evacuation to remove the trapped air from the pouch. that being said, males get along fine, and will even court each other.
females can develop problems related to non-transferred eggs not being properly reabsorbed, causing them to literally decay inside the
SH, resulting in a severe internal infection. females will also court each other, altho not to the same degree as males.
pouch emphysema is more common than non-absorbed eggs, but is more easily treated.
hmmm...so much for my "quick reply"...*blush*
pair or single? 
ryan 
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