As you noticed, they seem to prefer low flow areas. I've also found that they aren't big fans of light, and that they proliferate in the presence of excess organics. So as I see it, you have several options. You can try increasing flow, increasing light (out of interest, what kind of lighting do you have?), cutting down on feedings, or increasing skimming. I believe there is a possibility that a banded coral shrimp will eat them, but perhaps someone can confirm the likelyhood of this event, and of course, you'd want to consider one of these carefully before purchase, as they don't have angelic reputations. Finally, I would venture to say they will not take over your tank, and even if they don't, they don't pose a real threat. In my opinion they're evidence that your tank is doing well.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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