Yes you definitely should do the bottom as well to create a continuous new seal. If you just do the vertical seams you wont have good bonding at four points where the verticals join the horizontal and these points are where there is considerable pressure.
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210 Gallon slowly gaining population.
Foxface, Naso, Coral Beauty, 2 Clowns, 2 Chromis, Orange Anthias, and Striped Goby.
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