crap.....a trace was spotted this morning....i brushed and vacuumed in the rain....this stuff is NOT fun...

FC was 11 when I checked before bed...I added 5qts just to be safe...and it held during the night...but with a residual amoutn of this algae on the bottom this morning...should I be adding more sodium bromide tonight? I would think if I had any bromide left in the pool then the FC would be be dropping alot over night?