What size tank? How high is your intake? What has been your rate of evaporation? Do you have a lid? Do you live in a desert?
haha size is mini M which is 36x22x26cm (approx:14"x8.5"x10"), my intake is about 3 inches from the top of the tank, my rate of evaporations = not sure. i've been trying to measure it but with water changes (it's a relatively new tank) it's been tough estimating that. no lid, no desert - i'm upstate NY which is cold af! hahaWhat size tank? How high is your intake? What has been your rate of evaporation? Do you have a lid? Do you live in a desert?
sorry i misread that part of the intake. my intake is about 5-6 inches below the top of the tank and my outflow is about 3 inches below.You'll be fine. It won't drop that much in 10 days, and like JJ said, put plastic on top if you're worried.
The bigger question is why is your intake so high? You might end up with dead areas down low if you don't have any water circulating down there.