Did you also heat your blix to the 100 mark or leave that at 50f? That might be your problem? If your temp is that low in the house (you're crazy) then you might have had temperature drop in the developer bath. Heck even Holdong the tank for the proper development time during agitation would cause a severe drop in temp in such a cold environment....
You might want to cook it at 105 next time so as the temp drops it won't be so low at the end?
Mamiya: 7 II, RZ67 Pro II / Canon: 1V, AE-1, 5DmkII / Kodak: No 1 Pocket Autographic, No 1A Pocket Autographic | Sent w/ iPhone using Tapatalk
I didn't develop at home. I did it at Rayko (a facility here in San Francisco). I don't use blix, I use bleach and fixer separately. Neither was at 50F. They were both at 100F (I kept checking).