08-13-2013, 05:57 PM
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Hi Phatz. It sounds like your molly could have gill flukes, judging from how her gills are moving more rapidly. For treatment, I would suggest removing her to a hospital tank or container and treat her with either 3 tsps of AQ salt per gallon OR a proprietary medication that contains praziquantel, such as Parasite Clear tabs or Seachem ParaGuard.
For hardness, well . . . mollies thrive in hard water so no worries there. And most cories are tank-bred and are much hardier in regards to water chemistry so as long as there are no sudden changes in the water chemistry, they should continue to do just fine. :)