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My last test results, the pet store told me they were perfect (they give free water tests). I have two mollies in it (one slightly larger black lyretail molly). I have not seen my molly give birth yet. I do partial water changes once every two weeks (i change out about 1/2 to 1/3 of the tank). I feed it two mashed up pellets for pond fish. The pellets are about the size of corn. I noticed a week ago that my molly had a dark spot (black)behind the gills. I thought it was pregnant, because its belly was very large. the black spot disappeared, but came back with the brown spot. My black molly appears to be fine now. I have noticed that the white molly used to chase the black one and nip its tail when feeding. The black molly gets fed, and its bigger too. However, there came no noticeable damage, so I ignored it. Although you said it could be extremely weak, I doubt it would heal back anyways, so I took it out of the tank just in case it carried any disease or parasite. I have the tank filtered day and night, with a heater that keeps the temperature at about 80 degrees Fahrenheit. I dechlorinate my new water with this liquid that my pet store recommended. I recently cleaned my tank (7 days ago). Also, I fast my fish 1 time a week.
Additional Info:
My molly tank is about 9 gallons with gravel on the bottom. It has a pretty strong filter with two filter media slots. I keep both filled. 80-82 degrees.
Both tanks are "aired" with air stones.
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