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A regular dose is enough to kill red bugs. But we do 2-3 treatments over the course of one month, that way you are sure to get everything. Acro crabs (except the furry ones) are beneficial to the corals. Kinda weird that you guys are so anti-crustacean. Must be a guy thing.
We've found out the hard way that nuking a tank to kill a pest can cause very big problems for corals, not just critters. We dosed Furan 2 for zoo pox hard for 3 days and even did water changes. Well, nearly all of my really nice high end zoo collection bleached and several have died.
Treating corals in moderation is better even if you have to do it more times.
What most members of my local club have found is that one treatment at the dosage I described takes care of all the redbugs. Multiple treatments were initially recommended at 1 week intervals, but it was found that Redbugs don't have an egg stage and give birth to live young. What I have seen in larger shrimps and crabs is that most are not affected by a single treatment at the large breed pill (23 mg interceptor) per 400 net gallons conentration. But hit them at this dosage three weeks straight and you will kill most/all of them.
Liken it to exposing a human to a sublethal dose of poison three times in a row. First time you may get sick but recover. Second time you are still recovering from the first exposure, so you may get sicker and die or you may get sicker and then recover. Third time you are so beaten down from the first two exposures that you die.
I saw that happening in my own tank the first time I treated for redbugs and did it three times in a row. I had crabs and shrimp that lived the thru the first treatment, some died in the second, and all were dead by the third. Then Reefers started reporting that they got all the Redbugs with one treatment, and it came out about there not being an egg stage. So why OD it if you kill things you don't have to or don't want to?
I'm not a marine biologist, but I am a Registered Nurse, and have some understanding of the way medications work. The above is my experience.
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