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Hi Guys and Girls, I've not posted in ages so I hope you are good. I have a completely new set up 1m x 1m tent, Viparled 675w LED and my own hydropnic setup consisting of 32 liter plastic box reservoir, a cement mixing tray, airpots, water pump and a micro irrigation set. Cement mixing tray https://www.amazon.co.uk/Plastic-Builders-Mixing-Cement-Plastering/dp/B017A085W2/ref=sr_1_1?s=diy&ie=UTF8&qid=1473076697&sr=1-1&keywords=cement+mixing+tray 32 litre reservoir https://www.amazon.co.uk/Wham-Plastic-Storage-Boxes-Litre/dp/6040194316/ref=sr_1_4?s=diy&ie=UTF8&qid=1473076744&sr=1-4&keywords=32+litre+storage+box I have Airpots sitting on top of cement tray, which I've drilled holes in to allow nutes to drip back into reservoir underneath cement tray. I used normal garden hose £5 for 15 meters and attached Micro irrigation https://www.amazon.co.uk/Selections-GF4001-High-Quality-Micro-Irrigation/dp/B001RCA2JO/ref=sr_1_11?s=outdoors&ie=UTF8&qid=1473076860&sr=1-11&keywords=micro+irrigation My question is how harmful is the green algae growing on the roots coming out of the bottom of the airpots? Here's some pics. Toaor PS: Plastic bag in middle of plants is CO2, plants are four weeks today and about to put to flower. I'm using Dutch Pro.