I would try the siphon method with a few siphons going simultaneously but keep in mind that that does require the bucket to be lower than the level of the tank. If you put the can on the ground and then lift the full bucket later that should work fine. Don't bother taking any more than 50% and position the intake so it sucks up water anywhere from the bottom to mid level in the tank. Less DOC's in the water you take that way.
I would take 40-50% just because that would simplify things like acclimation.
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