Never had any issues with Tunze going back 30 years. Yes I had a complete Tunze system on a 100 gallon tank and it was the greatest tank I set up. One of my customers (aquarium store owner) saw the tank and bought it on sight with all the contents at a good margin for myself. He was stunned by the vitality of the fish and inverts in the system. I still miss that tank. Maybe someday! Still have Tunze running on small 40 gallon tank that is about to get rebooted and moved to a larger tank. Just have to make the final design choices. The tunze skimmer is about 15 years old in the tank and still running the old pump with not impellor replacement yet! Tunze and Eheim are the best pumps and equipment I have ever used in long term tanks.