just got a new marble motoro it has the same thing two other marbles of mine have. they are flat dark brown to black. the other two that i have i have noticed no signs of growth, movement, or reproduction of these things. i had a thread in the past little response and know one knew what it was. now that i have three that have this now and the recent symposium that i regret not going. i thought i would bring this up again. i have tried prazi,salt no luck i am trying dimilin and salt on one ray now. here is a pic hope it helps.





