The only major effect that pH has on breeding A. nijsseni is the number of viable eggs (= potential # of fry) you'll get. Temperature affects sex ratio. Please refer to my reply to Doug Dunlop's 03 Feb 1999 message, "nijsseni temperature", for specific results of temperature/pH values on this species. These results of Römer's are are based on a large number of nijsseni spawns:
pH 4.5/23º - 14 spawns, pH 4.5/26º - 20 spawns, pH 4.5/29º
- 12 spawns
I'd say this is statistically very definitive. Any reports to the contrary seem to be anecdotal by comparison.
Cory and Susanne Williamson wrote:
I have read conflicting information regarding the sex ratios of A. nijsseni produced at varied pH levels- can anyone tell me what the effect of pH on the sex ratio actually is. Cory