thomasina
Aquarium Advice Freak
When folks say that it is okay to top off your tank, exactly what are they saying? How much is a top off? And how often can you do it before you have to do a WC? Every Saturday I do a 10% change since my numbers are perfect and consistent and on Wed. I do a tank check: trimming plants, cleaning out filter intake sponge and so forth. The water does evaporate about 2 inches every week, even tho it is not near a heater vent, fan and the lid is always on tight.