I don't think kalk will work as a treatment (believe me I've tried this) because you just don't get enough contact time. Even if you shut off the pumps, all it takes is for a fish to swim by and it floats off.
One thing that was suggested to me, so I'll forward the suggestion along, is to smother them with underwater epoxy.. I haven't tried it yet myself though, but it seems like it could be worth a shot..
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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