I just got some brer molasses and I know it's 1tsp per gallon but not sure how to mix it with my flowering nutes I'm in week 2 any help would be appreciated thanks
Mix 1 tablespoon per gallon every time you feed. It's fine to mix with your other nutes. It's best to mix the molasses into warm water (so it dissolves into the water evenly) and then dump that into your water with the nutes. You can use molasses all the way until harvest, but there is really no need for it in the last two weeks of 12/12 if you flush. The main point of molasses is to help with nute uptake, and when you flush you are trying to rid the plants of excess nutes, so it's really counter productive. But like I said, it won't hurt to use it right up to the end. You really cant go wrong with molasses.
I honestly don't keep track of PH. I used to but it was never a problem and it just got repetitive. I haven't touched a PH meter all season. I'll have to let someone else answer that.