So far so good with mine, however it's only been a few days but there are no signs of them at all. I used lemon juice before and that didn't work as they just shriveled up and then came back the next morning.
The stuff I have is also like white-out. But it's pretty weird stuff because when it came into contact with my tankwater, it started to sort of solidify. I guess that's the chemical reaction it has to either water or the minerals in the water.
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