Just wanted to share an interesting development. I've just realized I have been keeping my 5 black neons and 5 harlequin rasboras at 65 degrees Fahrenheit for who knows how long, at least 6 months. However, there has been no deaths to speak of. I've had this group of black neons for a little over 2 years now, and I have had 2 of these rasboras for at least 3 years, counting the time i had them in my 10 gallon tank for a bit. They have been just fine in that time period, and have grown to full size of an inch or an inch and a half. I'm appalled that I let them tolerate this temperature, so i thought I would share my failure once again with this forum and thank the fish gods that they have lived.
A sigh of relief from this fishkeeper!