That isn't an excess of light. A lot of times BBA happens with inconsistent or low CO2 injection, but that isn't the issue either. The best way to kill it is to trim back any leaves and remove if they are really over grown with it, and spot treat everything else using a medicine dropper with either seachem Excel or Hydrogen Peroxide (H2O2). There are a few creatures who are known to eat it, but probably none would be safe with a lizard. True Siamese Algae Eaters (SAEs) will eat it, but you have to make sure you get the right ones - there are a couple other species of fish that look very similar but will not eat it. Amano shrimp may also eat it when it is young or if it isn't out of control, but I would think a lizard would make a short meal of either.