Yea i am successfully killing off some bba right now. I direct dose 2oz h202 via syringe with the filters off and lights on a few times a week. Also, i simply dose 2oz of h2o2 with the lights on and 2 with the lights off. Never totaling more than 4oz per day and never more than 2oz at a time. I have a feeling that this post is confusing. enjoy.