1+ It takes time, patience, and careful observation. IME, it is always come down to co2 and flow for co2 and nutrients distribution.
I don't disagree that if you have BBA highlight can make it worse/harder to control, but co2 isn't always the problem. There are plenty of folks here that run co2 until there fish are gassed and they still have BBA. I've seen BBA grow in all tank lit conditions. I've seen BBA growing in an indoor koi pond with no direct light. How 'bout all those dim-lit LFS tanks.