Unless you lay all the details out on the table, you'll get generic answers.
Some of this is in your 60G thread, but we have no idea about current lighting schedule/distance, ferts, etc.
A pic of the algae in question can be useful. Several types are commonly called BBA.
Is the algae on the substrate in a high or low flow area, or distributed evenly? Is it on plants? Particular ones? Any noticeable relation to lighting distance or high/low flow there?