My top off stuck open two days ago, I found it when the sump was on the vergo of overflowing. I checked the salinity and found it at 1.015. Lots of things looked not so good. I added salt directly to the overflow so that it would mix by the time it was returned to the tank, then started draining the sump. Raised salinity back to 1.025 and drained about 15 gallons total. My anemone, corals, shrimp and fish returned to normal behavior within half an hour. The total event happened in less than two hours, but i would get the salinity up quickly if it were me, especially with just softies.
I had a 10 gal nano setup that would raise two points a day just with evap. If I did not top it off one day then it would be up four points. 1.020 - 1.024. The softies are tough but other inverts will not like the drop, especially shrimp IME.
Mike
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This all started with a ten gallon and two clowns.
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