endler population almost all female?

I just gave away all but one of my endler males (the one left is a peacock and I'm trying to encourage that color pattern). There were fewer than I expected, but I didn't think much of it. I wasn't worried about replenishing the males because I still had lots of females (most of which were presumably pregnant), juvies, and fry.

I've been watching the tank, though, and I haven't been able to spot any males aside from the one adult I kept. (I am looking for gonopodia, not color---I know they can take a little while to color up.) The little ones are hard to see clearly so maybe I'm just missing them, but I'm starting to worry that there's something wrong. Could there be a genetic problem? Something with the water? Temperature? Something else?

Advice greatly appreciated!

THE V said:

http://www3.interscience.wiley.com/journal/118633533/abstract?CRETRY=1&SRETRY=0

Cooler water = more females. Warmer water = more males.

32C (90F)= Most males without gravid female death.

Pretty cool huh

Click to expand...

Wow! I don't have a login, so I can only see the abstract, but that is fascinating! I'd been keeping my tank on the cool end of their range just to save energy through the winter, so that probably explains the female-heavy sex ratio. I'll go crank that heater now! Thank you so much!

EDIT: By "crank" I mean "begin a gradual increase"---just so no one thinks I'm going to shock my fishies.