Used EK Mystic fog coolant but turned clear after a week. Probably down to my lack of cleaning the previous loop properly.

I got the non RGB version of the EK GPU water block. so I stuck an addressable RGB strip on the bottom covered by black electrical tape.

So the flow indicator... I attempted to create my own RGB adapter cable from Corsair to EK, so the RGB was compatible. But I ended up blowing the LEDs by mixing the pins incorrectly. On the back of the flow indicator is 2 addressable LEDs with a Corsair connector, which worked well with mystic fog but annoying with clear coolant as the led spots aren't covered.