Why do the pods come to the light?

[yohann976]

Since I've recently purchased a scooter blenny, I decided that I needed to also purchase some live pods. During the day, I can't see them; but at night they are all over the place. If I shine a flashlight into the tank, I can literally see thousands swimming around. This is the interesting part, when I place the flashlight in a stationary position; the pods will congregate right by the light. It's not a small number either. There's about three hundred pressed against the glass right by the light. It's like a mosquito attracted to a bug zapper.

Is there any scientific reason why the pods congregate towards the light?

 

[yohann976]

I'm thinking that the pods are phototaxis. I'm guessing that they might see this flashlight as a generic light source (as if it was the moon) and they are attracted to it because it's seen as a navigation tool.

But I could be way off, lol.