Let's take a closer look at what's in The Bayer porduct it and how it might work or do harm.
The soil and garden Bayer Complete Insect Killer concentrate has 2 active ingredients:
1) The cyfluthrin(.36%) is very toxic to fish and other aquatic animals. Toxcity for fish in parts per trillion is scary to me. For perspective inverts die at free copper toxicity in parts per billion. This stuff is 1000 times as lethal to fish as copper is to inverts. It's a relatively large organic and kills things with things with porous extoskeltons as it diffuses into them and blocks sodium clearing channels blocking of nuero signals causing paralysis. Whether it can permeate the cell wall of coral tissue or not and be freed up later is a big question. I don't know how long it lasts in water so build up with multiple frags added overtime might be an issue
If I use it and I'm inclined not to at this time ,I'll use it sparingly , avoid treating any porous plugs or rocks where it might have a better chance of hanging out and rinse treated specimens very thoroughly before putting them back in the tank.
The second active ingredient is imidachlorpid(.72%) also kills by paralysis. It is broken down quickly by photons and last from 1 to 4 hours in sunlit water. It is not very toxic to fish but lethal to inverts.
From wikipedia:
<sup id="cite_ref-EPAproblem_9-5" class="reference"></sup>
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<sup id="cite_ref-EPAproblem_9-5" class="reference">
</sup>
"Aquatic life
Imidacloprid is highly toxic on an
acute basis to aquatic
invertebrates, with
EC<sub>50</sub> values = 0.037 - 0.115 ppm. It is also highly toxic to aquatic invertebrates on a
chronic basis (effects on growth and movement):
NOAEC/
LOAEC = 1.8/3.6 ppm in
daphnids; NOAEC = 0.001 in
Chironomus midge, and NOAEC/LOAEC = 0.00006/0.0013 ppm in
mysid shrimp. Its toxicity to fish is relatively low; however, the EPA has requested review of secondary effects on fish with
food chains that include sensitive aquatic invertebrates.<sup id="cite_ref-EPAproblem_9-5" class="reference">
[10]</sup>
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It's not clear whether the imadachlorpid alone would be sufficient to kill red bugs , aefw or other pests. but it is available without the cyfluthrin in other products for fruit trees and as a termiteacide.
The other Bayer product being reported on the SPS froum thread is Bayer complete insect killer with germ killer for the home. It contains cyfluthrin and a bacteria /fungcidie and no imadachlorpid.