MM is marsilea minuta right? not much experience with them. understand from tanks i see with them that the leaves (lobes) can be singular or multiple(up to 4).
in my opinion to get a carpet of them, you would probably be looking at CO2 injection.
from this site
http://pets.thenest.com/plant-marsil...ium-12111.html
it seems that you need slightly chilled waters (28c or lower) to grow them well.
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