I have one of those kicking around and have found them to be very finicky sometimes you can let it go for a week and the cup will be half full so you empty it put it back on, wake up in the morning and it has overflowed back into the sump for half the night....I took it out and put in a Euroreef skimmer instead!!
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500G Mixed Reef

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Electrician, Electronics Technician, I can help with any electrical questions you might have!!
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Kevin
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