You only need to put it in the container for a very short time , sometimes just a few minutes as the vibrations seem to induce a feeding response .. I've read of some people who have odd ones that will ONLY eat when they're in a moving car !!
As to the vibrations ... Many years ago I had a Royal that had a RI . I cured it myself by putting the Royal in an enclosed container with a hand held nebuliser which was nebulising F10 . The nebuliser was vibrating strongly and I wondered if the Royal would be scared but after a few minutes I noticed the Royal completely wrapped around the nebuliser like an octopus . It did that EVERY time for the next 10 days !
That suggests that they actually like vibrations maybe it reminds them instinctively of live food !?
Could it have been trying to constrict the nebuliser ??