You know I'm somewhat surprised that the Grammar Gendarme does not refer to them as "zoa's". I forget where I first heard that rant, "They're not ZOOANTHIDS they're ZOANTHIDS so why call them zoos? Zoos are places you might find zoas" (or some such).
TriLinear, thanks for your thoughts (and kind words regarding the amount of time I've kept it ... It's funny that one tends to forget or overlook the positives ... "guilty"). I am giving serious thought to the small-group/sharem idea, we'll see where that goes.
On an interesting side note, I feel it's an important distinction to note that it is not so much "predatory" as it is "highly defensive." It shows no interest in eating anything larger than mysis sized pieces.
As for the law of probabilities ... I think you're completely right. It really is a question of "when" not "if" and anyone who feels otherwise is probably naïve.