I had a black molly die within 4 hours, I fed the fish at noon came home from work at 430 she was dead?! this fish has been through alot as she was the sole survivor of the mollies i had when I stocked to early she survived the ammonia poisining, nitrite poisining while the tank was still cycling. I got one male molly so she wouldnt be lonesome
and he is fine. DO you think it is just the toll of living in a tank that wasnt cycled ( she survived me emptying all the water and starting new, I didnt know much at the time, obviously!!) or something else? My water tests are perfect 0,0,1. Tank is overstocked I think it is 30 gallons I have 2 golden gouramis, 2 kribensis chichlids, 3 angelfish, 2 chine algae eaters, 3 tetras, 3 neons, and one molly, all are relatively small as of now. Any ideas, now that I have told ya what a total beginner I was 
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