What kind of unit is it? I just fixed a vertex unit the other day, the fittings were loose causing a weird vacuum in the unit. Re sealed the unit's fittings and it fills now.
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360 gallon sps reef, 180 gal sump, bubble king supermarine 300, 4xmp40Wes, 2 x 6215 tunze waveboxes, 4 ghl mitras
360 Reef Tank
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