I like the fill_rainbow effect,

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1

I like the fill_rainbow effect, but I want it on ALL the LEDs at the same time, rather than cycling through them. Is this possible?

2

You could cycle around the color wheel using fill_solid to fill all pixels with the same color.

EVERY_N_MILLISECONDS(50) { //cycle speed
static uint8_t hue;
fill_solid(leds, NUM_LEDS, CHSV(hue,255,255));
hue++;
}

FastLED.show();

3

More info in this post on using fill_rainbow that you might find useful.
https://plus.google.com/100542328320334100166/posts/Y5BdWFEvfo1

4

Cheers Marc, I’ll fiddle around some more

5

Brilliant, the fill solid works. Cheers