So I am fairly new to the aquarium hobby and have only dabbled in freshwater so far. I love the fish varieties and coral in saltwater tanks and have always been interested in starting a saltwater tank. One of the things I've noticed at my area LFS's is that all of the surfaces and equipment inside the tanks seems to have corrosion or barnacles and it doesn't look very appealing. Is this just something that happens in saltwater tanks over time and nothing can be done about it? Do you just replace out anything that looks bad every couple of years? Is this a problem with tank maintenance? Thanks!