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i've heard they can propogate that way but in only a couple weeks i doubt they would have because they are slow growing. also moss balls propogate by sending out a few loose but still attatched strands which then grow into a baby ball attatched to the mother ball. if you like your moss ball, don't cut it in half cause it will never be the same again.
50g-lungfish
30g-angelfish
29g-planted tank, kuhli loachs, neon tetras, pleco
20g-blue yabbie, danios
10g-cycling for shrimp
2g and 1g- 1 snail each