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Filter experiment to control algae

So, about 9 months later things are looking good, I only have a gravel substrate, only do 50% ro water change 1 per week, each filter gets cleaned once every 5 months. I don't touch any thing in the tank except pull a load of plants out every now and then. I dose 0.5 tblspn potassium nitrate 0.25 potassium phosphate & 0.25 trace 3x a week. Attached is a video of current state.
 

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