meadeam Posted July 9, 2022 Share Posted July 9, 2022 I had around 15 black mollies in a a 36g. They were all from the same generation, and fully grown. A few of them reproduced again, and 4 of those offspring survived past the eaten-by-parents stage. Then the first generation started dying off one at a time. I'd notice a fish looking lethargic, or sitting on the bottom, then in a day or two it would be gone. Naturally I checked water parameters; no ammonia or nitrite, small amount of nitrate within acceptable range, no chlorine. 75-77f. My water is hard with low buffer (I will look at the exact numbers). When fish kept dying, I did a water change regardless and two rounds of API General cure followed by the requisite water changes. Fish kept dying until there was only on left. I thought he made it, but 10 days after the second-last of his generation he also died. They were around 1 year old. The 4 offspring of that ill-fated generation are still in the tank, and have never shown any signs of illness through it all. They are less than half-grown at this point. Flourite substrate, moderately planted, Oase filtosmart thermo 100. Other inhabitants include a few stray shrimp, and about a dozen mystery snails that were quite small when the fish were still alive and are reaching full size now. I moved the snails in because the tank is rimless and I wanted them in a place I could easily find the eggs before they hatched. Any idea what may have happened? I have a different 29g tank with tetra, rasbora, and corydora with some approaching 4 years old. Maybe mollies just don't like my water? Link to comment Share on other sites More sharing options...
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