Originally Posted by joseramentol
also quick qest, when a little bit of water evaperates am i supposed to add fresh water or salt water and is if fresh water do i need to add any chemicals to it before i put it in ?
The water that evaporates is pure fresh water, this makes the remaining water in the tank become more salty. So you need to add FRESH water. Water conditioner is a must if you are using tap water, most recommend "Prime", it's a white bottle with a reddish label, you can find it at most pet stores.
You need to make sure you keep the water level at the same height to make sure your salinity is stable. You could draw a line so you have a rough idea where to top it up each day.
I have never had a tank that small so I can't tell you how much evaporation its likely to have but if you keep a cover on it (glass etc) then you will have much less. Personally I don't like to cover my tanks as I want to get a good gas exchange with the water and air, the payoff is that I have to put over a gallon a day of fresh water into my 72g. I use what's called an Auto Top Off or ATO. It is a float switch in my sump (tank below my main tank that houses filtration) and when the level drops it powers a pump from a container of FW
and fills it up automatically. This makes it much easier on a bigger system and keeps the salinity stable. It is possible to rig a DIY ATO up for a cheap solution (as i have on both my tanks) but it is kind of ugly in a display tank and better suited for a sump.
Another thing, surface agitation is very important, you don't want any still water on the surface, if you have enough agitation on the surface then you don't need an airstone, which is good because all airstones do in a SW
tank is create salt creep (when salt builds up on the outside of the tank and makes a mess). Also one thing worth mentioning is that you want the tank temp as close to 78 degrees as you can, if you have it hotter then that will also contribute to more unwanted evaporation.