What flow do mollies like best ?

That depends on what kind of mollies you have in there?
I've got molly species that are slender and those that have a firm bodyshape. The more slender molly species I have occur mostly in water with more flow. The more firm shaped ones like moderate till slow flowing water.
I have dalmatian mollies that look like this


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Most fish like a calm area to rest and a current to swim into sometimes. This can be accomplished by having a small powerhead or airpump with airstone set up on a timer. The timer turns on for 30-60 minutes once or twice a day and the fish can swim into the current for a bit then rest after the current stops.

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