I had my 13.5 up for 8 weeks. After a couple water changes the reservoir where the pump, filter, and skimmer is stopped filling up. I'm using all fluval products suggested by the manufacturer. It's only keeping water a couple inches above the pump. When I turn the pump off the reservoirs fill back up. Not sure what to do. I've messed with everything, adding more water, less water, adding water straight into the reservoirs. Nothing worked. The small hole in the plastic. Not sure what its for but anyway my Orchid Dottyback was half way in the hole dead. My Maroon clowfish is also dead. Not sure how or why. All the snails and crabs are still thriving. I'm just concerned for future fish I buy guess. Not sure what to do at this point. Do I contact the manufacturer about these Issues? I'm at a loss. This is my first saltwater. Kept fresh water for years.