Did you check the salinity of the tank water after you microwaved it? You tend to have a lot of evaporation in the microwave. 1.023 is kind of pushing it on the high end for rotifers, and if you salinity went up in the microwave, ... well, I have absolutely killed off rotifer cultures by screwing up and letting the salinity get off on the high side.
Good luck!
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--Andy
"And chase the frothy bubbles, / While the world is full of troubles. . . ." --W. B. Yeats
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