Originally Posted by landshark
When youre doing a partial water replacement do you have to take the fish out of the tank? Or can you just pour it in? And do you have to add just plain water that has been dechlorinated? I read that If you replace the water that has been removed with treated dechlorinated salt water that your salt level will climb high.....
The fish stay in the tank for PWCs. RO
, or distilled water is best for SW
tanks. Not tap. So you don't need to dechlorinate the water if you use one of those. You use fresh RO
water for top-offs from evaporation. For PWCs, you need to mix some salt in the water that you add. You will be removing salt along with the water when you siphon out water, so you must replace it. If you always only add fresh water, your salinity will plummet and fish will die. Just give the salt time to dissolve before you add it to the tank, you can't add undissolved salt to the tank water. There should be directions on the side of the salt container.