I used lime juice with no problems, only used one syringe full at a time (5mL). The big thing that makes the difference is to make sure that you inject them so they fill up like a balloon. If you squirt the area around them, or stick the needle right through them, it won't work. With the kalkwasser mixed with water it seemed to work a little better and slightly more forgiving. Generally if you stay on it and do it when you see them it's not that bad. I let it get out of control for a bit because they weren't really bugging corals. Even though they weren't bugging them it just helped them spread better and then became a problem, and a real pain to try and control again.
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