We have a 55-gallon saltwater tank. We installed it in a wall between our barroom and our family room in 1997. I hate it. I have wanted to take it down for the past 2 years, but I have two clownfish that won't die. One is a sebay clown and the other is a maroon clown. They have had about 4 birthdays in our tank.
At first, it was hard to regulate the water and we had a lot of problems with ick. We bought a UV sterilizer that controlled that problem. I also learned that you shouldn't put copper safe into your tank to kill ick if you want to keep any coral in the tank. Copper kills coral.
I will not do anything to kill my 2 clowns outright, but I didn't replace the UV bulb the last time it burned out. (1.5 years ago) I also haven't done any type of water change since 1998 or 1999. Water evaporates from the tank and I readd it. That's a water change for me.

I haven't lost any fish because of that. There was gill disease, ick and some other problem that a fish had that was not determined, but I tried to treat it with an antibiotic in a hospital tank, but it didn't survive.
The kids keep the tank clean. DD is a little weird about cleaning, so she is wiping down the tank all the time. We have magnet cleaners on both sides that she drags to keep the algae down.
My theory as to why these two fish are survivors is that they were both inexpensive. One was $7 and the other was $20. Had they been $80 fish, they wouldn't have lasted this long. I also use Nitrex. That is changed about every 6 months and it controls the nitrates, nitrites and ammonia. It sits in my biological filter.
I agree with the person who said that you shouldn't buy anything from major chains. They have more diseases in their tanks than anything. Find a fish store that you can build a relationship with for your best results.
For supplies, I like
www.thatfishplace.com . It is in Lancaster, PA, and a pretty neat store. They have people with whom you can speak if you have any questions along the way. They handle both fresh and saltwater fish.
It's not a hard hobby, once things are established. Saltwater tanks are very expensive to setup... especially if you want to add coral, due to the special lighting requirements. I'm just sick of mine and I know what I want to put in the tank's place. At the rate we're going, I'll probably get my plant ledge in 2015.
