Plant filter

What is a plant filter? I've got a lot of space in my filter sump. So i planted some fast growing plants to suck up the nitrates. Works or not, im not sure myself because the plant is not much. However its worth the effort as it looks nice. The light for the sump plant is on at night. Hopefully it can supplement some oxygen to the main tank at night. I also bought some plants for my main tank, it will be transfered to main tank when the sump plant has establised. I dun want algae growing on main tank.













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