Oh - hmmm - why not just raise the refugium a little (put it on bricks or build a little platform) so that the top is at the same level as the top of the sump? Then it can't overflow (well, not without the sump overflowing too).
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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