Evaporation - what is a reasonable amount

[Coralgurl]

I'll check the salinity when I get home as I'm sure the water level will have dropped off. I did test it yesterday before topping off and was at 1.027 and hadn't been topped off since Friday as I was away for the weekend. I keep it around 1.025. I'm doing a water change tonight, hadn't been monitoring it as the tank has been stabilizing over the last bit and am seeing improvements. Will start to monitor and see what the actual difference is....