Emily in Everett Posted January 3, 2022 Share Posted January 3, 2022 (edited) I have a 90-gallon tank with 30 gallon sump. I usually have to top off the sump once every 5-7 days to keep up with the evaporation. But over the last month I'm now having to top it off every 2-3 days - like with a 5 gallon bucket! Like I come back from a 2-day weekend and the filter sponges are exposed to the air! The only differences I can see are the colder drier weather (though the humidity in our house hasn't changed much according to our weather meter); and the sudden explosion of Amazon frogbit (I introduced a few leaves a few months ago; took a while to get going; but now it covers 2/3 of the surface and would cover 100% if I didn't do a weekly culling). I'm curious if a solid cover of surface plants would change the rate of evaporation in a tank. Any ideas? Edited January 3, 2022 by Emily in Everett Link to comment Share on other sites More sharing options...
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