need large tubs for new water

I'm in a bit of a pickle.. I'm upgrading to 450G and the water storage tanks I have all have openings on them that are too small for the circulating pumps I have; i'm unable to mix the salt water :(Does anyone have any large troughs that I may borrow to mix water?  I need about 200G worth of them to make sure I have enough water when the new tank arrives this week. Thanks in advanceD8179950680
 
Are you starting the tank live or dry?  If dry I'd just mix the salt in the tank.  If dry I'd consider doing it in two steps, or dumping a $20 powerhead in the bottom for mixing.  I have the water capacity, but mine aren't exactly portable, or empty.
 
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