Originally Posted by BigRedsReefs10
Why would the salinity change? Your removing water not letting it evaporate. And mebbid why so long of a drip? 3 gallons seems a little excessive, and would take a long time.
If you remove water and top off with fresh then you're decreasing the salinity which is why you need to top off with salt water to prevent the salinity change.
I use 3 gallons on average because that works for me. I've seen many times that people suggest dripping even more water. It will depend on the difference between the water parameters. Dripping a coral or fish doesn't require as much dripping as inverts. It's situational how much I use.