Use pliers, squeeze hard on the tab and pull putward. It might help if you put a lighter at it for about 3 seconds far away enough so the plastic gets warm... don't melt it, only make it warm.
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75 Gallon
Rena FilStar xP3, Aquarium Systems Visi-Therm 200W (2), Coralife 48" Aqualight 260W 6700K
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10 Gallon Hexagon
Hagen AquaClear 30, Visi-Therm Deluxe 50, DIY CF 20W 6500K CF, Hagen Natural CO2 System :: Bloodfin Tetra (1), Red-eye Tetra (3), Black Skirt Tetra (3), Harlequin Rasbora (6), Platy (1), Otocinclus Catfish (1) :: Rotala Indica, Hygrophila Difformis (Wisteria), Cabomba Carolinia
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