I am not sure why the bottle gives you that impression. The bottle description
says it gets "rid" of flatworms. In my vocabulary that means "kills".
Sorry, I thought I got the info from the description on the bottle. I read the KZ website and from there I got that impression:
http://www.korallen-zucht.de/en/shop/products--technology/problem-solving/4850_flatworm-stop.html
It states on the website:
"Product Description
Flatworm Stop
Right now we have an effective help against tissue eating flatworms on Acropora and for ailing SPS.
Flatworm Stop strengthens all kind of corals and reduces parasitical flatworms on Acropora corals at the same time. Very valuable ingredients are assimilated directly after dosage. In our tests also ailing small polyp stony corals recovered and rebuilt the basis as well as gained back the original coloration".
The description:
"effective help against tissue eating flatworms on Acropora and for ailing SPS" doesnt lead to to infer that it is an outright targeted flatworm killer.
Also,
"Flatworm Stop strengthens all kind of corals and reduces parasitical flatworms on Acropora corals at the same time". From this description I would infer that the potion "nourishes" corals rather than target killing AEFW's.
Additionally since it states that "
Very valuable ingredients are assimilated directly after dosage". This leads me to believe that perhaps some form of substance is taken up by the coral which may either discourage (maybe even harm the FW's) after feeding on the coral tissue or perhaps whatever chemical is in the potion, it improves coral health/immune system and perhaps even aids faster recovery.
So to sum up; most of the descriptive text in my opinion points to something other than a targeted attack on FW's.
Whatever the case may be, if this is indeed an effective help, then I am very pleased for SPS coral keepers. Having lost MANY SPS that I collected from all over the UK, this is a welcome product for me.