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.
I am glad to see this comment, because it's hard to digest the message that algae issues can be resolved largely by having good CO2 levels/flow/etc - it's just not true in all cases.
On my tank, I had my CO2 running steady 24/7 with massive flow and a high enough levels to kill off some fish and all the invertebrates - a bright yellow DC! That was a clean restart of the entire tank, and included some aggressive Excel use and constant pruning etc. The BBA came back and took over the tank within a couple of months.