I have a 55 gallon tropical freshwater tank. Algae has completely taken over the tank. I have never had this kind of problem with algae before. 20 years with this tank. My lighting is the same as it has always been. I have no live plants. It is just baffling to see everything coated with algae. I have four algae eaters and treat the water with algae killer, but still the problem seems to have gotten worse. Is high nitrate the problem or what do you think.algae problems 001.jpg