Okay I really got an problem my chocolate gourami tank has been taken over by captain black beard. And i don't know what to do, it is a no co2 tank with only ferns and anubias some buce.. Turned the lights down to 50% for 8h its really low light sits in the darkest corner of my house.. 30% water change once every 2 weeks 1/3 ei dosed weekly.. But the BBA is growing more and more.. I do something wrong i know that but what is the question.. In my other thank BBA only comes up if there is a decaying leaf under direct light, it then is only a tuft..