The tufts sound like black brush algae, which would imply too much light/ not enough CO2. Sometimes it grows in high flow areas no matter how much CO2 you have. Lowering light is usually more effective then, but I would try dosing Seachem Flourish Excel first. Spot treat the tufts daily with 10mL Excel in a med syringe, filters off for about ten minutes, repeat daily until it turns red or grey and wastes away, then change to regular daily doses to the water column, 10 to 15mL should do to maintain a good carbon source for plants and keep the algae at bay.
Excel works as a fert and an algacide, being that it contains gluteraldahyde. Don';t know if you can get the stuff there, I've heard of people using something called Easy Carbo which I believe is the same thing as far as carbon goes, but don't know if it contains gluteraldahyde or has any direct algacidal properties.
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