water change in fish tank?

There really is no reason to be adding salt unless the betta is sick. What are you using to dechlorinate the water?

You should probably increase your water change schedule to 1/3 weekly. If you get a gravel vac siphon hose you can vacuum the gravel each time and cut out the "complete change" cleaning every 6-8 months (that will potentially kill your tank's cycle).

When you change 1/3 the water you remove 1/3 the salt. When adding salt add only enough for the water you put back in, not the entire 5g.

Freshwater aquarium salt helps bolster the immune system for most fish preventing illness in general.But some fish like plecos or loaches are sensative to it and die from salt. The very best thing yiu can do to prevent fin rot is to keep the water clean and warm. Salt isn't even needed.

On a finale note try not to overclean your rocks. There is good bacteria living there that contribute to the health of your aquarium.

The salt wont evaporate out but will make a solution in the water. As you vacumm the water out it will remove some salt. If your betta is acting normal and your not seeing any salt crystalization on the rocks or decoration id say your doing fine. With the water changes you will remove salt so a pinch would most like replace what is being drawn out especially if drawn from the bottom of the tank.

Salt does not evaporate. The only way to remove it from the water is to remove some of the water. Don't add more salt if you are topping off evaporated water.

I wouldn't really do a complete change, there is no real reason too and it might do more harm than good. You end up killing all the beneficial bacteria in the tank, which helps keeps your ammonia and nitrate levels down.

Sounds like you take good care of your betta though :) keep up the good work!

I don't add salt but, you should always leave some of the old water in the tank. Your beta will live longer. He's got his own little "eco system"!

clean for a small tank ,well a small tank gets filthy faster than a 10 gallon tank,,,2 times a month clean bottom only your rocks with your kit ,,change your filter every month,,,,check your P.H. 7 clear every few days,,and 1/3 your water once a month...when you clean your rocks let your filter catch all the waste you didnt get and rinse it out good and put back in,,,,,,,,yes you are doing the right way,,,,read up on yahoo.com how to keep your tank clean,,,good luck

Really you should be doing 25% weekly water changes and Betta fish do not need any salt .