how to daisy-chain ws2812s ring leds?

I'm using multiple ring ws2812s devices and I am wondering if I need to connect both grounds when daisy-chaining them together or can I just use three wires. Here is the device... https://ebay.us/b2OWFS (no that's not me or anyone I know selling)

I am wondering if I need to connect both grounds when daisy-chaining them together

Yes it is highly advisable to power both the 5V and the ground to both ends of the ring.

freakdaddy:
I'm using multiple ring ws2812s devices and I am wondering if I need to connect both grounds when daisy-chaining them together or can I just use three wires. Here is the device... https://ebay.us/b2OWFS (no that's not me or anyone I know selling)

Those seems strange. Vcc, and In/Out are obvious. Why it has 2 grounds and thus 4 connections instead of the bog standard 3 connections for these kinds of lights I don't know.

I think run Vcc and 2 grounds to each one. Wire is cheap.