Looks like quite of bit of condensation in it. Personally, I wouldn't use it. Do you have a thermometer to test your water temp? A thermometer that is independent of your heaters and controller is a must. I lost a tank full of SPS due to a stuck on heater and controller not shutting it off. Murphy's Law says that a heater and a controller can malfunction at the same time. I used three different thermometers to test the tank because I couldn't believe it. As far as I know the tank temp only got to 85 degrees, but I guess that was enough to kill my corals, some of which were several years old.