Mason, I would find those things quite unlikely.. As long as the super glue is cyanoacrylate, it should be fine. As for the rusty cutters, I think just about everyone puts something slightly rusty in their tanks from time to time. It has never bugged me, but on the other hand; my tank aint doing to great right now either!
It sounds more to me like some parameter peaking or dropping every once in a while. I would just keep a close eye on any fluctuations throughout the day/week.. Sounds like you have a problem that is quite inconsistant... I would also consider the possibility of some type of bacteria that is attacking the acros.. Have you done any large scale water changes? Maybe a 30-40% is in order...
hope I can help!
-Adam
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