Try to connect RGB-chained fans (connected to OUT of each other) to Octo itself using this adapter
https://shop.aquacomputer.de/product_inf…roducts_id=3829
Also what happens if you connect only one fan's RGB to splitty/octo, do it light up correctly?
Also remember that for correct lighting, you need to know each fan's LED number and their total number must be below 90 leds (OCTO's per channel limit), and a LED controller in aquasuite must be created covering all connected LEDs.