top off water?

[Beemo]

do i have to add anything to top off water? the water is RO but im not sure if i should add any calcium or ph upper etc? or is it ok to just add plain RO water?
small 10g nano tank, water evaperation is about half a gallon every two weeks (im guessing)
i plan on low light corals, crabs, snails and a clown or 2 in the future

 

[Brandon's Reef]

I just add fresh water

 

[Andrew]

Some people add pickle lime or ect. I just use plan pre-mixed water and then add liquid calcium and ect seperate when needed. Sometimes Ill use lime water to keep my calcium high. Make sure you don't add too high of saltwater or else your salt will raise. I use FW most of the time because salt doesn't evaporate so its still in the water.

 

[bertoni]

Plain RO water is fine. Depending on the water parameters, you could consider dosing limewater, but that's only if calcium and alkalinity are needed. I'd watch the SG, and try to adjust it no more than 0.001 units every other day or so.