Before I'd muck around with pH changes, I'd ensure good water quality and give the fry a real good chance to survive - best might be isolate gravid females in a java-moss packed-tank and feed small foods like artemia nauplii. I maintained Endlers' (my nick: EndleSS livebearer) for something like 10 years this way. Biggest problem was finding homes for the extra fish. Sometimes, it's handy to have a turtle or other cull machine, to.
Too bad GSAS doesn't have a BaP, then everyone would want Endler's livebearers and other easy fish :-)
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