That's coincidental. I was just staring at the kids' turtle tank because it was SO GREEN. They have UV clarifiers for cheap on eBay. Try this: http://cgi.ebay.com/36-W-UV-Steriliz...item19c23eda48

The clarifier needs power to run, but it will kill the algae and make it clump up. I would put it inline with the water going to your grow bed. The dead stuff will settle and provide nutrients to your plants. The worms will probably eat it too, which is great.

Quote Originally Posted by brent
When algae grows in the fish tank, would the algae killers for fish be harfull to the plants in the grow beds?
YES! DON'T DO IT.

Try to keep as much sun out of the water as possible, and you shouldn't have a problem with algae.