I was for a bit doing infrequent water changes due to conservation reasons. Did it work? Yes but definitely slower growth in the SPS. LPS/softies didn’t mind.
Once I got my mini fridge up for auto dosing foods it became in essence automatic water change as I use SW to flush the line each time after. Then a doser removes about that amount. In short, .8 gallons a day for a totally monthly change of 30% after accounting for some new SW also being swapped out.
Def seeing faster SPS growth.
Not doing water changes may work -but I think for some types of coral more than others . Also if you are using 2 part such as sodium chloride and sodium carbonate or bicarbonate as source for alk/CA you may not want to go that route of no water changes-
I was/am using all for reef so ionization is not an issue.
Once I got my mini fridge up for auto dosing foods it became in essence automatic water change as I use SW to flush the line each time after. Then a doser removes about that amount. In short, .8 gallons a day for a totally monthly change of 30% after accounting for some new SW also being swapped out.
Def seeing faster SPS growth.
Not doing water changes may work -but I think for some types of coral more than others . Also if you are using 2 part such as sodium chloride and sodium carbonate or bicarbonate as source for alk/CA you may not want to go that route of no water changes-
I was/am using all for reef so ionization is not an issue.