I've never owned a marble that I'd consider mini so I can't answer that but my female motoro was 12" when she first became pregnant and 19" a year laterDamn spell check. A eczs has listings on aquabid where the males are 9 inches, fully rolled claspers, triple perimeter spotting, darker perimeter on disk by the spotting, and he claims to have females that are 14 inches that are pregnant. And lastly, they are wild caught from Columbia. From what I've read through the threads on here, they seem to match the description of the mini marbles...