While most of the popular desktop all-in-one aquariums are great enclosed systems for work or at home, it’s very easy to forget about topping off evaporated water and replacing the filter media. Because the tanks have a lid and the back panels are coated with a black vinyl material, it takes some effort to check on the water level and swap out the carbon filters for new ones. Only after the pumps start cavitating and filling the display with bubbles do most people realize the water level has dropped too far, which immediately induces panic and rushing to get the tank filled properly. So, what we’re saying here is to not neglect your AIO nano. Check the water level and replace the filters, because we know you forgot to do it.