My truck has 2 x 100 gallon fresh water tanks. 75 gallon gray and 25 gallon black. I bought mine used so had no input into the sizing. The gray and black tanks seem to be about the right ratio. When the black is getting full I dump. Only once did my gray fill up before the black. When the gray fills up it comes into the shower. Black is easy to see how full, look down the toilet with a flashlight. If you're doing 100 fresh I think you'd be fine with a 25 black and 75 gray.
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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