Currently I run 1.026 as well, but for no particular reason really. I've run 1.023, 1.024, and 1.025 over the past few years as well. I've never ever noticed a difference (as far as livestock is concerned). I don't think that there is a right or wrong answer, so long as your salinity is within an acceptable (ocean like) range (not too low, not too high), and so long as it is stable. But even then, not too low and not too high is relative..
Stability is key though, that's why it is important to keep an eye on your evaporation as evaporation can quickly raise your salinity. As it raises your tankmates will adapt, but then once you've realized that your water needs to be topped off, you are going to probably have to dump water in there which will lower your salinity again but will probably lower it a lot quicker than it was raised due to evaporation. An auto top off mechanism can track evaporation quicker and virtually eliminate this swing as it only dumps in a little water at a time to compensate for evaporation on an hourly basis 24/7.
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