Just hit the 5 year anniversary for my 100 gallon. One of the things that has surprised me the most after 5 years is the life of the equipment I have. In the last 5 years Ive only had 2 pieces of equipment fail, which is amazing considering there is 20+ things currently plugged into this tank. The two failures have been a JBJ ATO unit and the main "brain" unit for the apex classic (which sucked to have to replace). I celebrated its 5 year anniversary with a Neptune Trident. So far Ive been very happy with the trident. Ive had two kids since the tank has been started, the automatic water changes from the DOS and the trident have been the biggest helpers ive bought, saves tons of time!