Coralvue hydros question

[jrloyd]

I’m trying to figure this hydros system setup. Probably an easy answer but I’m kind of confused. I have a Launch, a Blenny, and an XP8. All 3 are plugged in to a GFCI 4 outlets plugin. Do I need to run a BUS controller between them, only data, Not combined data and power, or is it not necessary if the units are within 15 ft of each other? I feel like the instructions say you only need the BUS cable if the units are greater than 15ft apart. My 3 units are all within about 1 foot of each other. Thank you