The easiest way, for me anyways, is to "T" off your drain line. One leads to the sump, the other to the drain. That will take care of the taking out part. Then you could have a resevoir filled with mixed water and a pump. Once you've drained enough tank water, turn the valve so that all water is directed back to the sump. Turn on the pump that moves freshly mixed saltwater into the display and you should be good to go.
Mind you, I'm not sure how much room you have to work with.
In terms of fuge size. On a 280 if you have room for a 50-75 gallon fuge you'd be laughing...
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75 gallon with 20 gallon sump in the works.
R. Bacchiega. Tattooer
I didn't smack you, I simply High Fived your face.
I've got so much glue on my pants it looks like a Friday night gone horribly wrong.
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