I have 2 tanks, one upstairs with my SPS corals, and a downstairs tank with just softies and LPS. I used to change my upstairs tank, and use the waste water to change my downstairs tank. I never did anything else to it, no dosing, GFO, bio pellets, or even running carbon. And all was good with it . Fish and corals were all happy. I would check the parameters occasionally but they weren't far out. And I just used Instant Ocean (still do).
So am not sure if you have another "designer corals" tank, but if you do, you could do the same. Then you can change the water at the same time and amount as you do with your fancy coral tank, but no additional salt costs.
I can't do this now, though, as I only use one sump for both tanks, because I only have 1 chiller, which is needed for the summer. Next fall, though, I might go back to separate sumps and only using fresh SW in the upstairs tank.
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