Best tubing for overflow to sump?

[Kyle46N]

Looking for opinions. I've use the clear tubing to go from an overlow to a sump, but algae grows in it. Anyone have any other ideas or experiences. I know PVC is an option. I would like something solid in color, but really flexible. Yet smooth on the inside. Thanks!

[mikedelgado]

I saw some 3/4 inch black flex tube at lowes

[LoneStar]

You could also wrap the flexible clear tube with tape (electrical or duct) or possibly paint it so that algea will not grow inside of it.