Mebbid
Aquarium Advice Addict
It's possible but hard to tell without pictures.
I would go back to your normal dose as ferts are rarely ever the reason for algae. I just can't tell on the pic's but it just doesn't seen right for the start of BBA. I'd go back to dosing the ferts and up the Glut. Then keep your eye on things. If you start to see any fuzziness starting you'll know it's BBA starting but I don't think that's it.