How much water change for larger tank?

[Aquareef123]

I have a 6x2.5x2 tank (around 1.5 ton of water). I currently keep lps and softies. If I change 10% per week like what most reefer suggest, that will be 150L per week. Is that excessive?

Anyone with similar size or bigger tank can comment how much and how often you change water? Do you use NSW or salt mix? Many Thanks.

[tofubox]

Hey, personally i prefer using salt mix, it really does help using DI water if you getting self mix. And yeah u more or less require to do a 10% change weekly initially. When it gets more stable, you can do smaller changes or a 1 time big change per month, like wad i usually do. That being said though, since your tank is 6ft, water should be much stable therefore allowing more room for your discretion. It mainly depends on how good your filtration system is as well, and how heavily stocked your tank is. Bigger skimmer, cleaner water. etc etc.

Big Tanks require much lesser water change compared to a small tank. Simply said

With regards to your question, its hard for anyone to say how much water u should change, 10% is a rough guide. But it all depends on how much crap is there. Personally, i reckon you can decide for yourself whats a good amount, as long as ur keeping up with water changes when necessary.

[kenyee]

Depend on how heavily stock vs system, the water condition (ie. Water coloration, odor, etc), the fish condition (ie. Swimming or not, eating well or not, etc), coral condition (ie. Coloration, opening up or not, growing or not, etc), overall tank outlook (ie. Cleanliness, full of algae, etc)

If the water is good, dun change too much..looking at 10% monthly shd suffice..dosing of chemical to replenish those loss elements is required though especially for coral tank..some uses large water change to replenish those loss elements..there is no right or wrong changing how much water in what period..happy reefing

[ASHWIN]

My tank is 6x2x2..Mix reef i do 20% wster change weekly 10% is not excesive..its good to do..trace elements toped up etc..

[ASHWIN]

i some times also just 20% monthly..i just dose what is needed and vinegar dose for what ever that is not needed no3 and po4

[brojj]

Don't forget that during water change, u will increase the KH & Ca if the reef salt contains higher value of KH & Ca than what u have in your tank before doing water changes. Too much will cause a drastic raise in the KH & cause some instability which some sensitive SPS or Corals will have a negative reaction to. 10% weekly should be sufficient, even to replenish the trace elements we cannot measure, unless we re talking about emergency here, where is the amount involved will be much higher During emergency, it will be better to choose losing some compared to whole tank wiped out. Also during water changes, beneficial bacterias will be suck out & replenish with reef salt water which does not contain benefical bacterias, however, this should not be too much of a concern because we have enough of those in lives rocks or if u re using new sea water (NSW). What's more, benefical bacterias can be easily replenish by commercial products or wait for them to reproduce.