I'm certainly not an engineer (rather an engineering DROPOUT) but I'd never proceed without jackposts at least under the tank. I'd have them on either side of the tank really.
My livingroom 225 gallon has (5) 2x14 laminated beams under it's rear with a pair of jackposts supporting its front which rest on an 8x3 footing poured beneath the basement floor.
When full i can jump (220lbs I am) next to the tank and I see the FAINTEST ripple. My old 65 gallon used to move quite a bit in my last house on the main floor with just a single set of jackposts beneath it.
Just my 0.02 though. I did this planning before the house was built.
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