I'm not sure if I have a problem, but wanted to get opinions from some of you experts out there. My grow has been flowering for 20 days, and the fan leaves are starting to yellow and then brown from the bottom up. I have been feeding with bloom ferts and liquid bat guano, but not a ton (I always err on the side of less w/ nutes). I know some yellowing of the leaves is normal during flowering as the plant uses nutes to build flowers instead of vegetation, but does this look ok to you for 20 days in? As you can see, the rest of the plant looks healthy. Any feedback would be greatly appreciated.