Flubendazol (maybe spelling is a little different in english) kills
different kind of worms, planaria, hydra and some else very effectively, but
does not affect plants or fish. The effect on crayfish I do not know.
The chemical is used in anti-worm-paste of dogs and cats. This paste would
spoil water quality in an aquarium, but it is used as a powder for cattle
and pigs. A tip of a knife of this powder you add to your aquarium and the
planaria will be gone within two weeks.
To obtain the powder, you have to contact a veterinarian which treats farm
animals. They usually have some cans of flubendazol and may give you a small
portion.
Good results
Jorg
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