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Dino, Butterfly (Carol), and I had a conversation months back about fish sucking on other fish. Carol told us that she had read somewhere that the sucking of another fish' slime-coat is usually indicative of a lack of protein in the sucker's diet.
Mollies need a good bit of veggie matter in their diet, but feeding nothing but veggie flake may cause a protein difficency. I have no idea what you feed them, just pointing that out.
(That is just one possibility, but I'm not positive as to whats going on with your fish.)
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