I'm thinking that they might be refering to the mollys liking salt in their water?? (mine do well without salt)
I know that the dwarf puffer does not need salt.
mine did well with frozen blood worms then I started feeding her frozen brine shrimp, now she almost wont touch the bloodworms she will just wait for the shrimp. I suppose it is easier to cut up anyways
Of course she gets the snails too, she loves them!!
I would'nt put mine with my mollys only becouse I think that my dp is so calm they would bother her.
What a personality they have!!!
My tank has alot of plants in it and i think that makes a big difference.