One other thing to consider - don't know where you live or if you have slug
problems but if you do, they love the algae and seem to prefer it to plants.
If you go out at night and turn on a light in your greenhouse, they're easy
to spot.

"Gene Schurg" wrote in message
rthlink.net...
I'm getting algae growth in the greenhouse. The glass is easy...I just
squeegee it when there's condensation on it. My problem is on the
aluminum
and brick.

Should I worry about it? What should I use to get rid of it?

Gene