Good news today.. no other corals seem affected, so I hope it was just the stuck SCWD that blew the hell out of the acro and killed it and the mushroom rubbed the duncan to the point it killed some heads.. crossing my fingers that was the the problem anyway.
Side note.. man did I pull an idiot move last night.. forgot to turn off my ATO, which if it was just an ATO wouldn't be that big of a deal, but it is an ATO with KALK water in it.. so I drained my tank for my 40G waterchange and then noticed my ATO got empty.. ummm.. oops. Shouldn't be plugged in.. so my pH got up to 10.0 for about a minute as I pumped new water back in.. then after running for about 3 minutes the pH dropped down to 8.4... scared the crap out of me. When I noticed I forgot to unplug the ATO I looked at my pH probe and it only read 8.6 in the sump. I though, whew.. ATO must have been almost out. Nope, as I was draining and the tank was still running the ATO was filling up the sump and going back into the tank as quick as I was draining it. Luckly my ATO is only about 4 gallons. Still.. lesson learned, crisis avoided.. and luckly nothing bad happened with the pH spike.