dimilin is found in anchors away. I guess I would give it a try.
Ingrid

http://www.singaporekoiclub.com/know...ication.html#d

Dimilin

Dimilin® is a trademarked brand name for diflubenzuron. Dimilin® /
diflubenzuron is one of many "benzoylphenylurea compounds" which are
not pesticides but are regarded as IDI (insect development
inhibitors). Other compounds in this category include "Program",
"LarvaDex", etc.

About Diflubenzuron and other benzoylphenylurea compounds:

* Insect gyrase stops crustacean moulting, ends the life cycle of
parasites you can see, like Anchor Worm and Fish Lice.
* Dimilin These parasites are cleared in 3 - 4 days.
* Dose: One gram per 3785 l.
* Mix well in water, distribute evenly around pond. Many people
use a plastic gallon jug and shake it well.
* Non toxic to filter, fish or plants
------- * Will kill crayfish, dragonflies, etc.

Dimilin® is not, and can not be, toxic to your fish at any dose. Even
though it is not water soluble, it works like a charm.