Water change Q

[BAD FISH]

Something i dont understand.
My Nano is 102l, i do 25l water change every 2 week but then all the coral sulk for about 3 days. I haven't done one for 4 weeks now and everything is still very happy and opening up as they should....why is this happening.
Must i maybe change to only one 25L water change a Month

 

[Gus]

Hey bud, I have a 28G Nano and used to do water changes weekly. All my corals etc would be upset for a few days and my urchin wouldn't eat etc.

A mate of mine Vic_Za suggested maybe not doing the water changes so frequently and just monitoring levels and parameters. Since then, I haven't looked back.

Maybe a monthly change is the way to go for your tank ?

 

[trad]

I'd say make sure the temperature etc of the new water is the same as the tanks. 25% is a significant change. Also make sure you mix your salt some time before you need to use it so that is properly dissolved.

 

[trad]

Thing about delaying water changes is that it leads to bigger swings and changes than regular ones. So just keep that in mind.

 

[leslie hempel]

A few things could be happening

Temp swings
Or
Introducing water from a polluted sore possibly worse than the levels in your system
Also just check your salsify as nsw has a higher sg