For only a few days, if you cruise down to San Mateo, you can borrow one of my 44 gallon brutes. I'm in the midst of a nitrate battle, so will need it back for water changing. However, it takes me days to fill up the mixing brute, so you can borrow the other one while this one fills. I usually just remove water into that brute as a measurement as to how much water I can replace, but since I'm doing the water change tonight, I can mark the water level with tape on my tank and lend you the "used water" brute.
Let me know.
V