Should be fine. This happened to me in a betta tank a few months back. Tank hit 90F, what a shock when the glass feels warm. Plants didn't notice (was just anubias and java fern however). The betta just seemed to be super hyper, no other effect, but they are warm water fish, they do fine at higher temperatures. Unplugged the heater and opened the lid to let the temperature drop slowly.
All I can say is, watch those max/min lines on the heater, and don't forget most heaters say to unplugged for 15 minutes before draining water. Of course, freak accidents happen too, such a shame.
Really sorry about your tetra and the one shrimp.
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