OK, all fun aside as I can't come up with something witty ....
Maybe in the wild they bolt in whatever direction is away from the threat, or away from the rocks, or whatever, instead of just straight up.
Maybe in the wild they bolt 'into' the rocks but can't do so in our little glass boxes....
I feel that, in our tanks, theres nowhere else to go but up as we haven't given them enough places to hide ???
It'd be interesting to see a diver show us their environment and spook some ...
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