First of all thanks for the reply. You are right, I should have mentioned a little more info.
I am not doing anything you mentioned, just changing my water one a week. I change about 10 gal
of my 56 gal
tank once a week.
My PH is about 7.5, lake Michigan water in the Chicago area.
My lighting is just a strip light, of course with a good plant bulb, I will look for the wattage tonight if you like.
My tank and plants are doing fine, growing and spreading as I would hope.
Tank has been up for about 6 moths now. String alge showed up about 2 months ago.
I also do have some grass like plants, and they are shooting out runners and spreading slowly, I am very happy with that.
My goal was to get 'low' light "easy to grow" plants so I would not have to do any co2
injection or put in any additives.
No other alge problems other than this string stuff. I never has to clean my glass.