I would suggest a smaller tub. try maybe 10-12 gal. I did an 18 gal and it was just a beast of water and nutes and removing the water, replacing the water, the big lid folds under the weight of the plants. the list goes on. You'll have plenty of room for big roots in a 10-12 gal.
Also for anything above 5 gallons I would have 2 or more dual air pumps totaling 4 or more air stones (did you get air stones?).
Something else to consider, I've added igloo water cooler style spigets at the very bottom of my rez's so if I have the bottom of the rez elevated enough I can just drain the water out and add a fresh nute solution with out removing the lid. This may not be something you want to practice through out the grow, but towards the end when you've got about 10 lbs. of plants and all your huge colas are tipping over with out the support of ties it can be quite handy.
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