Yes, Imidacloprid is banned in Canada so you can't use bayer insect killer. The Bayer Advanced with Germ killer does not contain Imidacloprid though, so i don't know if that is available in Canada.That has worked for me as a preventative dip for red bugs, aefw's and montipora eating nudibranchs. I used a 4 ml to 1 l concentration for 15 minutes.
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