sump is getting algae
 

I built a 11-plant garden. The sump is getting algae. How to I get rid of it? Should I paint the RubberMade "sump" to keep out light? The "Home Hydroponics..." book by Lem Jones claims that you can prevent it by keeping a tight lid on the sump. I have a small 2.5 inch round hole for the cord, and water line. I can tape this up. Anyone else had this problem? thanks, mark

Hello Mark
Yes painting the container is a good idea. You can also use contact paper for shelves and it comes in hundreds of colors and patterns.
Ron