Water Changes for SPS Tank

I think you can go with many different methods...Most people are very quick to think there routine is the way to go. I think each individual hobbyist needs to find a system that works for them based on individual husbandry techniques. Smaller tanks would benefit from more frequent water changes while larger tanks could go with month water changes.

I spend a good amount of time each month making new water (25%) for my tank. I spend more time making sure its oxygenated and salinity and temperature are identical. Doing this on a weekly or bi-weekly bases (with my current system) probably would result in me being less careful in matching water parameters. When I set-up my larger tank I will make water changes as simple as switching few valves from a tank filled via float switch, aswell as having identical measurements of salt.

Other then that I would go based on your bioload - more fish and corals you add the larger,more frequent water changes you should make.
 
I go 5-6 months at a time without changing my water in my 75g SPS dominated tank. I dose Cal, Alk, (and trace elements when I remember) feed 6 fish heavily, and broadcast feed the corals twice a week. I do the same for my 57g Softie/LPS tank.

I test the water monthly, clean the skimmer completely (total tear down) once a month, and change filter socks (25 Micron) every 2-3 days. I run Phosban and have a fuge with chaeto.

I have a close friend who does the same on his tanks.

Every tank is going to be different. Your fish and corals will let you know if something is off. You will learn as time goes by how your tank looks at it's best, and if things are not looking good.

If I see something not right in my tank, I will do a WC before the usual time, but it's rare that I have to do that.
 
Prior to my weekly 5% water change, I'll put my filter socks in place, blow detritus off the rocks, and siphon the shallow sand bed directly into the filter sock. I'll do the same with the chambers in my sump to remove accumulated detritus directly into the filter socks. When the tank clears of the suspended detritus, I'll do the water change, and remove the filter socks. It takes a little time, but I've seen great results in my parameters and health of my corals. I use Salinity salt that I've pre-mixed in a 32 gallon rubbermaid container. IMO, best salt mix available.
 
Why does everything have to be a debate. If your skills/husbandry are on par, water changes will be a minor aspect to your hobby experience. Find what works for you.
 
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