Wow! Okay thanks for the advice! Thats way cooler than I expected. They were an impulse buy from my LFS. Im in socal so before winter time comes again ill probably have to set up a separate cooler tank. Great looking gymnos btw!I would not keep Gymnos with any Central Americans (but I am a bit anal) because of the winter cool downs.
I used to let my Gymno tanks drop into the low 60sF and even into the high 50sF.
I found that cool down did lots of good for color and health.
Took this shot below right after cool down, just as temps were brought up to around70'F
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The photo above a grow out tank of Australoheros fry, and below a Gymnogeophagus community tank.