FuEL, I was thinking that it *could* be chemical, but perhaps the stimuli is a Visual Cue? Thus why it might be worth trying to keep an adult IN the tank, in sight, but perhaps not able to attack the larvae (thus a breeder net or perhaps a glass box with mesh bottom). Just a thought. Granted, it's been done before (or so peopel are claiming) - I wish folks were more up front with their info but I definitely understand the proprietary nature.
MP
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