Some of the more experienced fish keepers may was say they'd rather not use medicines or adjustments to fix any symptoms. Its best to look for the problem or address the balance, hence my suggestion of having a pleco or maybe some brine shrimp or anything that will scavenge the algae.
Another way of fixing the problem is to plany some super fast growers like errm (not to good with plant names) hogwort is it? Anyways, a plant that grows super fast out competes the algae for the minerals, nitrate etc in the water hence the algae dies off somewhat.
In all my tanks I have some fast growing plants and one pleco, they seem to keep it down for the most part. I also let the snails get on with it too, they dont damage the plants and add a little variety. I've never had the snails take over my tank tho, maybe I'm just lucky.
