I've been seeing alot of ray keepers talking about mm. But do mini motoros actually stay small ? How can you tell the difference in a mini and regular motoros?
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Mm is normally used for marble motoros. There are some people that say there is a variety of mini marble out there that stays under 12". My male marble is about that size and 3 yrs old. I don't know his maximum size but he definitely hasn't grown much in the last 1.5-2 yrs.