Do I need to dose on anything?

[Lionfish hunter]

Nope, no water changes. Did a water change about 3 days ago

That would explain the recent rise in alk but not the previous ones. I'm assuming 6/3 is today and is suppose to be 5/3? If you're not dosing anything this is confusing. Added alkalinity has to come from somewhere. it’s not like ph that can swing up and down.

 

[Randy Holmes-Farley Verified Community Expert]

Here are all my reading over last few days.

replaced the carbon bag and phosphate remover pads on my external fluval filter about 3 days ago.

"Last few days" of alk rise from 7 to 11 is exactly what time frame?

What is the measured alk in your new salt water?

Top off is what? (tap water can have a lot of alk)

 

[Hannahmunt]

"Last few days" of alk rise from 7 to 11 is exactly what time frame?

What is the measured alk in your new salt water?

Top off is what? (tap water can have a lot of alk)

I’ve been testing every three days.

alkalinity seems to going back to normal.