Ultitube 150 PRO?
The D5 NEXT's LEDs are controlled internally in the pump from the RGBpx tab in aquasuite.
d5rgb.jpg
If not using aquabus, the Ultitube RGBpx Ring can also be driven from the D5 NEXT's RGBpx/aquabus port. (same RGBpx tab as for the D5 itself)
Depending on how high you place the ring on the Ultitube, you would get one of
THESE cables.
Then run the cable from the D5 NEXT RGBpx/aquabus port to the IN port on the RGBpx Ring.
Be sure the RGBpx/aquabus port is set to RGBpx in the pumps settings (I don't know the default)
The waterblock can be driven by the OCTO using a cable from the link above and going to the IN port of the waterblock's RGBpx LEDs.
If you were to use the RGBpx/aquabus port on the D5 NEXT for aquabus, you would have to change the RGBpx ring cable and daisychain from the waterblock's RGBpx LED OUT port, to the Ultitube Ring IN port.