The only 'Cyclons' I know were the bad guys on Battlestar Galactica.
I have flush fittings on my black and gray tanks, the PO installed them I guess. I use them to add water to the tanks before dumping and flushing out the tanks and slinky after. While they are nice to have, I don't know that they are totally necessary if tanks are maintained properly. I got them, so I use them. Upon researching my rig, I remember running across info on how to install the flush valves, not that hard if you have access to the tanks.