30 cube IS on sale....as well as the 40 gallon stretch hex. HAve them scan it and it comes up $1 a gallon. i would go with the 30 cubes....makesgreat reef tanks cuz they are a great height to stack rock, you can light them with a single MH and not have any dark spots, plus they just look cool.
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fwiw, I picked up 2 40 gal stretch hex oceanics last night. $249 retail each gottem both for $80 bux...lol