Interesting. I asked because bellina/violacea are especially susceptible to cold. Just a few days below their minumum CAN cause leaf damage, or at least some discoloration. 68 degrees, though, is certainly warm enough - mine have nights into the lower 60s and are quite hale and hearty.
I would continue to approach these plants as if they're somehow infected with a fungus/bacteria of some sort. Physan 20 is a great choice to use. One application may not knock it all out, though, so be patient. I'm not, however, utterly convinced that the issue is this. Having lived in a house which used to have cats (welcomed) and now has mice (MOST unwelcomed) I've seen physical damage that resembles the damage in your photo. Thus, while treating, I would also be looking at environmental possibilities.
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