crsublette
coyotes call me Charles
There is no such thing as a "safe" algaecide. While Lou has used one for many years "safely" it should be noted that he has mosquito fish (which are very small fish) and not goldfish or koi.
Nishikigoi hobbyists also use algaecides, safely... and their fish are not small and are incredibly expensive... difference is nishikigoi relies on filtration, not plants...
@Big Lou has ALOT of plants whereas nishikigoi hobbyists generally do not have lots of plants... which is no problem...
Algaecides are safe when used according to directions.