Poor circulation and wild fluctuating levels of CO2 will cause BBA.
To try and eliminate it, first of all try to remove as much as BBA as possible by hand. Trim off the affected leaves and lightly siphon the gravel. Then try to ensure good circulations and also try to maintain a good level of CO2. Maintaining a good balance of lights/CO2/nutrients will help as well.
Low plant mass usually invites all sorts of algae, not only BBA.
High fish load will cause problems mainly because the biological filtration cannot handle the wastes and cause a spike in ammonia. Ammonia is the root cause of most algae, not nutrients like Nitrates or Phosphate. Its been a long misconception.
-Calvin
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