Type of salt

[drato11]

Usually in a stable tank, the pH level will not drop that fast. For measuring of salinity, do invest in a refractometer which gives accurate reading of salinity. Those floating hydrometer are not accurate most of the time from my experience. Remember to let your tank cycle properly after the addition of liverocks before adding fishes. Cheers.

[cdckjn]

If you want, you need to get the pH test kit to verify your water. same for the sg which is about 1.21-1.23 - you can get a digital sg meter to verify this.
If you are into corals, then these parameter together with others will be critical to you. If you are just dong FOWLR, (Fish-Only-With-Live-Rock) then just sg is important. Other issue like temperature is important to FOWLR as this depends on the type of fishes kept. so topping up with distilled water is important to you.

Thanks moderator, i do top up water with "Life" brand distilled water. But as i top up water, the pH level with drop too right? So do i need to add pH buffer everytime i top up? Im using dymax floating hydrometer to test salinity but the salinity doesn't seem to increase even though i added some amount of salt gradually. I will be adding more liverocks and upload pictures soon

[Cylence87]

Thanks guys..sharing a picture of my tank

[sheristopher]

Go get a Refractrometer. More accurate.

[sheristopher]

Are this green stuff in rock algae?

[spkentchai]

I use tropic marine salt

[Cylence87]

Go get a Refractrometer. More accurate.

On a budget constraint

Are this green stuff in rock algae?

I'm not too sure..

I use tropic marine salt

I am using that too..