Hi Jerry,

Algae comes in all sorts of colors and shapes. The UV light will only work on
the free floating single celled algae that lives in the water column. It won't
do anything for algae that grows on rocks, or that attaches itself to stuff
like string algae.
If you have a good mechanical filter working you can scrub the stuff off and
it will clear much of it from the water. Sometimes adding a layer of quilt
batting does a good job.


kathy :-)
algae primer
http://hometown.aol.com/ka30p/myhomepage/garden.html