How frequently do you have to add water to top off?

  • Since evaporation affects every single tank differently due to having lids (plastic, glass, etc.) or not, and the temperature difference from the aquarium water to the room temperature, how frequently do you add water to the aquarium to keep it at the same level?



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  • I mostly have to add water (about a gallon and a half) to my turtle tank every 3-4 days due to the open top (no lid), heat generated from the heating lamp, and a fan that is blowing from the vaulted ceiling like 95% of the time.


    All of my other tanks have lids, and maybe need 1/2 a gallon added to them once every 2 weeks or so.

  • This really also depends on the humidity level in the room. If it's winter, the furnace is probably on and that means dry air and so the tank might need to be topped off more often. In the summer, it's usually more humid which means less topping off to do.

  • I remember when I had my tank you would notice that the water had dropped within about a week and because of that I would always top mine up every 7 days or so depending on how far it had dropped within that time. I never left it any more than a week before topping it up though so that it wouldn't drop too far.

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