Tom,
Have you looked into Tilapia? They are simply great on algae. They can't survive temperatures much below 55 degrees, but while living they really do a number on algae. Here in Texas, I can now rely on Tilapia to completely control algae during the time the temperatures support their existance...then in the "off" season I use the granular cutrine to spot treat. Bottom line is I now use very little chemical and let the Tilapia do their thing. Also, many other benefits of Tilapia are discussed in other posts.
