Originally Posted by mudplayerx
My father had a saltwater tank about 25 years ago.... back when salt mixes were just becoming widely available to the public at an afordable price. They didn't even have skimmers back then. 99% of the petstores did not even stock corals because before the availability of the skimmer the because the failure rate on reef tanks was just too high.
There have been many other advances since then. I had a saltwater tank 18 years ago (which died during an extended blackout). Back then they didn't use live rock like we do today. Live rock handles many important filtration functions.
My skimmer broke several months ago. I had been negligent in getting the parts (and when I got the replacement part, the skimmer still didn't work). As my tank has still been doing well, I am not convinced that skimmers are necessary. My tank is lightly stocked (only 7 fish in a 75 gallon tank) but my corals are doing great now!
IMO, I believe that skimmers are necessary for more heavily stocked tanks or for tanks without much live rock. However, because most newbies tend to overstock, skimmers should probably be considered a recommended item.