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If I understand the question correctly you are saying that the glass is bowed out when the tank is filled with water.. No this isn't normal. Most all 30g do not have center bracing and is not needed. If the glass isn,t thick enough maybe thia is causing the problem.
Is it possible you bought a herp tank? They have much thinner glass than aquariums as they are not meant to hold water but only little land-loving critters like snakes and lizards.
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