I used vinegar to kill them,100% safe don't like to try dangerous chemicals in my tank,one small mistake and you can kill a lot of stuff..i just have a seringe and just blast the vinegar right in the mouth of the aptasia,some of them die at the first shoot some require another one but i kill all of them,had about 10 small ones and 4 huge ones..also all the extra vinegar it just act as extra carbon for the bacteria...
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