Whats causing this?

Ok i have 29 gal fresh water fish tank and recently started growing live plants in it but all of a sudden there is a rust color that starts at bottom of glass on the inside and is working its way up is this from the live plants or is it something else. Please if ya know what i can do to get rid of it and keep it gone let me know cuz it just looks nasty and ive changed filter cleaned the filtration system out and even cleaned the tank but it comes back also i have a bulb in it that is a pick color when last one was bright white could that make a differenceWhats causing this?Ok its sounds like red algae that means you need to do a clean through with your whole tank cause red algae is very dangeious and can kill your fish. So clean all of the tank. And go to the pet store and get a product to keep algae out of your tank.
Whats causing this?
It's algae. Get yourself a couple of Chinese algae eaters and it will disappear. I used to have algae on the rocks in my 38-gal tank; I put two little algae eaters in and within a week -- no more algae.
Whats causing this?
Don't get more fish or animals to rid the tank of algae, they will only cause more of it and add to the bio-load. Scrape it off and change the water. Rust colored algae is not good. Only dark green algae should be left in the tank and has benefit to the system and fish. Pleco's are not needed ever.