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Nice work and thanks for sharing! Summarizing your experiments with Pelv taeniatus at pH 6.5-7.0 and cond around 150 uS:
73 F ==> 25% male, 75% female
79 F ==> 50% male, 50% female
85 F ==> 75% male, 25% female
As far as you know, does the general pattern of warmer ==> male, cooler ==> female hold up for other cichlid genera with enviro-induced sex, like Apistos, Taeniacara, Nanochromis, ... ? And how about S.Amer and African killifish? Anabantoids? Has anybody compiled a list of articles on enviro-induced sex determination in fish?