some sort of hiccup in the manufacturing process would be my guess. i cant see it being much of an issue unless it was experiencing rapid and extreme temperature changes...
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- 33 Gal - 20Gal Sump, MP10/Hydor Powerheads, Aquaticlife 4x T-5HO, Vertex IN100, TLF w/Biopellets, Tunze ATO
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