I still really like the Fluval Spec V, but have discovered the first serious drawback to this tank. The lid has a hole in the middle so nothing blocks the LED light. This allows a lot of evaporation, which wouldn't be a problem if it weren't for the fact that the intake grate for the built in canister is set right under the lid. If the water drops even an inch, your filter motor is going to be running on air. If you have a betta or other air breathing creature, you probably start with the water level low and rapid evaporation will drop the level below the grate in just a few of days. Once you know this problem exists, you just keep a close eye on the tank and refill as needed, but the instructions that come with the tank contain no warning about this at all.