I was the one who posted the original B-12 fix.
I actually just waited till the tank was about 1/3-1/2 full, dumped in the B-12 in the can using a funnel, and then filled up. Repeat for 3 tanks. Fixed the issue for me.
You may have noticed another thread where the guy posted some sticky goo that was causing the problem for him: I think the B-12 dissolved similar gunk in my pump filter.
