Hi Everyone, we have a 4ft tropical fish tank and have a serious blanket weed problem! We don't keep the tank in direct sunlight and the light is on from about 12 noon until 9pm. Bulbs are correct for the tank but can't seem to get rid of this problem! We keep taking it out only for it to regrow again? Anyone any experience of this and can help in trying to get rid of it? Can't get real plants to live it either! We have checked the Nitrite/Nitrate and all good - any suggestions?