- last post: 01.01.0001 12:00 AM PDT
You're right, I don't know if there were Flood on Reach or not, but it is fairly safe to assume that they are not. First without sentient life the Flood all but starved to death and died. The only remaining examples of surviving Flood were left behind in complex, secure locations guarded by sentinels and were meant to exist only for study. If an outbreak occurred it is because some external force broke open the containment protocols thus causing the Flood to spread and consume said external force.
Now as for why I don't think Reach was such a facility is because it seems that the facilities on Reach were only meant to house the crystal and nothing else. If there is anything else inside of Reach it would undoubtedly be other artifacts or something of importance to the Forerunners. I highly doubt that they would leave behind Flood specimens near objects of such importance.
Of course I could be wrong about everything, this is all speculation based on observations.