I have 3 heavly planted tanks on each I would use a diffrent brand of liquid fertlizer I always used the correct dose but one thing all my tanks had was that green string algae my ferts have run out so for 2 months I have not dosed my tanks .My plants are still growing well and the string algae has completly gone.Now I know these liquid ferts always say will reduce algae but the opposite seemed to have happened to me.