I have a group of 6 F1 gymnogeophagus balzanii bella union Rio Uruguay that I got from Ken, and was wondering if anyone had any special tips on care for these fish. I will be housing them in their own 90 gallon and was thinking of doing a RO/tap water mix to get the PH down more to the upper 6's to 7.0 since I know they're software species. They've been tank raised on normal tap but would like to give them more of a natural environment with some Indian almond leaves and soft tap water. They're just little 1 inch guys right now. I've read giving them a "cold period" with dropping the tanks temp down into the 60s. Would that be necessary to do for young fish like these or should I worry about that when they're sub adults to adults?... Any suggestions on all this would be great! Thanks