Most of the people who posted stopped Vibrant treatment to dose Fluc. Vibrant has has some great success, but has also had some major setbacks for users. I think that some of the most reported issues with Vibrant are cyano and other bacteria blooms. This might be related to die-off of algae though. Like I said, I haven't heard of one person seeing any negative effects of using flucanazole, so I would go for trying that first. Adding in other products may counteract results. I would keep an eye on your nutrient levels as things start to die off, and perhaps even manually remove as much as you can before/while treating.