There is a lot of variation in time and dosage for Bayer. Even the product itself varies, with some people using Complete Insect Killer, and some using Home Pest plus Germ Killer. These two products each have one active ingredient missing in the other, and the one active ingredient they have in common (b-cyfluthrin) has very different concentrations in each product. This makes it very difficult to determine which ingredients(s) are effective, and what concentration people are actually using. I use Complete Insect Killer which has about 7 times more b-cyfluthrin than Home Pest plus Germ Killer. I use it at a concentration of 10mL per 1/2 cup for 15 minutes. I've only used it on a couple of Acros so far, but they tolerated it just fine and it definitely killed red bugs for me. This is probably near the upper limit of what most people use, but it seems to be very effective and harmless to corals so far. I'm going to continue with this practice on all my new Acros.