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Delayed post to some older ones. As far as random RTN... I dont know how closely you watch all parameters. (Keeping sps happy at the same time as softies etc can be tough (some have opposite problem their softies randomly die) For that reason alone I'd lean heavily LPS and softies that I think are exciting to most "noobs" to saltwater stuff. (Vs SPS are the expert aquired taste)
But with a school tank I'd be paranoid of just things in the air. Even if you make sure janitors dont clean your room. What if theres a temp janitor that doesn't know? What about when they wax floors and the like in the hall or anywhere. Unlike in a home, you have a bigger issue with air getting circulated all over the place. It's why with work we would almost use our gun before the pepper spray because we know thats going to end in having to decon and evac the building.
I am testing regularly now and making sure my numbers look good but I've given up on SPS. If I have any left when I'm able to set up a tank at home I will probably transfer them once things are established. I haven't lost any in a while but it seems random. Could be something in the air or from the kids I don't really know. My LPS, palys, and softies look great though. Someone recently suggested the size of my softies and leathers it could be chemicals they release damaging the SPS.
At best the toxins stunt growth a bit and don't allow for good sexual reproduction. It will not kill them. In any case, if you skim or use GAC, then they will get taken out pretty quick. The toxins are non-ideal, not killers.