The RC threads mentioned acclimation difficulties ie disappearing after only a few days. Somone speculated they may very well be starving by the time we get them and so particularly vulnerable to acclimation stress. Also they apparently have tendencies of going over overflows or sucked into powerheads. I've already noticed mine can be launched into the water column pretty easily - they seem very "light" and don't get a very good grip on things.
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