Afternoon guys,
So for the past 3 weeks we have been struggling to keep the water clean. There keeps forming a brown film (for lack of better word) across the top of the water, and the sand is turning brown shortly after we clean it. We have done 3 30% water changes over the past month and it still isn't working. I have changed the filters on the back of the tank.. we have a biocube 33 gallon. we have added nothing new to the tank or taken anything out. what can be causing this?
So for the past 3 weeks we have been struggling to keep the water clean. There keeps forming a brown film (for lack of better word) across the top of the water, and the sand is turning brown shortly after we clean it. We have done 3 30% water changes over the past month and it still isn't working. I have changed the filters on the back of the tank.. we have a biocube 33 gallon. we have added nothing new to the tank or taken anything out. what can be causing this?