Radion lightening storm

[Delphinus]

I went to a store once to look at some clams they just got in and the tank they were in had a lightning storm. I, um .. rather hated the effect. (Sorrrrrry I'm just sayin' ). Here I was trying to look at the clams top-down and the Radion was giving me a headache. Just as soon as I thought it stopped, it started up again.

Question, isn't this something you would have to decide to turn on? Did you know you had this mode setting? Or does it literally decide on its own to do this and you have no say when and how often?