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7,439 Posts
The 29 gallon tank is almost 50% bigger than the 20 gallon tank. That is significant. It is also 30 inches long, which makes finding a good light fixture a little harder, but it is big enough for the 2 watts per gallon guide to mean something. I agree with Dave, no one ever finds they have too big a tank! People with 100 gallon tanks regret they didn't go for the 180 gallon size. People with 1600 gallon tanks regret.......uh.......
