What flow do mollies like best ?

[16gallontanker]

Do mollies like a heavy current or a soft current?

 

[emeraldking]

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.

 

[16gallontanker]

I have dalmatian mollies that look like this

 

[Colin_T]

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.