need plant recommendations

I live in San Francisco and have a small 500 gallon decorative pond
about 18" deep. Of coure, Spring brings with it a huge algae bloom and
I'd like to put some plants in there to compete with the algae and
wanted some suggestions. Given the landscaping, the plants should grow
to no more than 18" tall, some shorter. Anyd ideas for good plants to
use for this scenario?

BTW, the pond just has a couple gold fish so fish load isn't a problem.

cc's offline to would be appreciated since my
news server is very unreliable.

Thanks, Bill