Finally an LFS giving some reasonable advice!
Depends what kind of anemone it is, but the behavior of wandering IS correct. They will wander until they find a place that suits their lighting and current needs, and yes they can and will sting things in their path. Just Tuesday night I saw some damage in a hobbyist's tank caused by a HUGE E. quadricolor that had reached out and touched someone
Having said that it is possible to keep anemones (and you did have the spelling right

) in a reef, but since you mentioned that you are new to the hobby, I'd recommend waiting before attempting one of these creatures. They are generally challenging at best to keep (some are more challenging than others), and it's recommended to have a mature and stable tank before trying one. READ all that you can about them, choose the anemone based on your ability to care for it (lighting, feeding, safety in the tank -- powerheads and intakes covered, etc) and if possible, get a captive propagated one (E. quadricolor or Bubble Tip seems to fare the best in the aquarium, and many specimens split and reproduce). Then choose clowns compatible with that species (Tomato, melanopus, fire clowns, perculas sometimes...Maroons all host in E. quad.)
Hope this helps,
Jenn
__________________
Member of the "J" Crowd & the BRW Crowd!
LFS Owner:
Imagine Ocean

Just keep skimming, just keep skimming, just keep skimming, skimming skimming! What do we do? We skim, skim, skim!