Marine fish can handle changes in salinity. You’d be surprised. This happens in the wild. I think it does make a difference being in a closed system. Especially after already being stressed from shipping. Stability is key. I would match salinity to shipping parameters next go round. So far as over topping off, that’s a tough one. Maybe someone else can chime in on that.so if I know I am going to be away for a day I should over top it off? Having the salnity drop below the proper level?
Why don’t you check your specific gravity. Wait a day and check again at the same time. Take notes. See how much it’s fluctuating. Gradual changes aren’t a huge deal.
Here’s a good read.
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