Oh, and while we're talking about it, wouldn't it be advantageous to add an overflow-type switch that could turn on a small light right above the siphon tube just as the siphon is about to start so that the rotifers (or whatever) can be concentrated right where you need them?
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--Andy
"And chase the frothy bubbles, / While the world is full of troubles. . . ." --W. B. Yeats
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