Tweaks to the animation will happen when time can be found Baz, though blue was tried for the water, and was deemed not quite as threatening as the red, but it was a bit easier on the eye than the colour-cycling yellow and black stripes (urgh!).
It's a really good animation, simple but gets the facts across.
I'd leave the red, it's the colour of danger in Nature and also the opposite of green on a colour-wheel so will give maximum contrast for visual impact.