"Water Changes" how often do we really do them?

[BucNtears]

Often wondered how often we really change it?
List your total gallons and how often.

Total gallons 160ish {120 w/ 75 sump/fuge.}
I try to do mine every 2 weeks roughly 30 gallons at a time. I've gone 2 months then changed out 60 gallons.

Thought fellow reefers might find this type of thread interesting.

[jenglish]

I had been doing them 5 gallons every week in a 30 gallon tank (w/ a skimmer rated for 90 gallons). I backed off to doing it every month to increase zoanthid growth but saw soem algae problems and I think I will return to weekly until I get it under control and then go to biweekly

[Miasma_F]

Approximately 110 total gallons (90 with large sump).

I change out 25 gallons about once a month. No real schedule.

[chaderic26]

5 Gallons a week on my 150 w/ 40 gallon sump.

[Sugar Magnolia]

I've gotten really lazy over the years. 30 gallons, 5 gallons once a month.

[Dustin_p]

10 gallons every two weeks on my 90g tank.

[patsfan1130]

10% once per month on all of my tanks

[BucNtears]

Going on whats been posted so far. I'm starting to think I could get away with less of a water change. Maybe stretch it out, say 30 gallons monthly..

[BuddhaKiss]

90G with a 20G sump, so about 105G total. Change 5G a week

[ChknWing]

I have a 55 and used to never change the water just top it off. This worked fine for about 8 months.. after that I think the live rock got saturated, b/c I had some corals that started to die off. I now change 10 gallons every week to 2 weeks. I have had all of the corals come back to thier full glory and had growth on the SPS frags I have where they were receding. Leathers aer doing great as well

[SNAKEMANVET]

20 gallons every 2 weeks,120 with a 40 gallon sump.

[Waterobert]

4 gallons twice a week in my 90g, I used to do 6 gallons every other day but got tired of it.

[jenglish]

I think you hafta either trust your tests or watch your tank and know if it needs it more or less. every tank is different.

[username in use]

I usually go by what the corals and whatnot are looking like, but it usually works out to 5gallons every two weeks, with top off in between. Oh yeah I have a 29DT, 20sump, and roughly 3gallon skimmer chamber, for a grand total of 52gallons, roughly.

[seapug]

10 gallons/week on my 90. I've missed a couple here and there but I'm pretty diligent about it.

[Superstretch18]

54 gallon tank w/ about 12 gallons in sump/skimmer. About five gallons each week to replace what's removed from wet skimming. Not including the additional ~5 gallons or so of evap.

And yes, I know that evap doesn't count as a water change, just wanted to clarify that the first five gallons excludes fw top off...

[BucNtears]

Agreed, You have to know your tank.
When I let my tank go 2+ months without a water change I started to notice little things here and there. What I found interesting is that when I did the water change{60 gal.} the corals and growth seemed to get a kick start of sorts.

Anybody else?

[ALH]

180g tank, change 15g weekly

[jbird69]

15% every month or so.

[schaef]

10-15 gallons a month on my 120

[luther1200]

I have a 65g and change 1g a day m-f. total of 5g a week. And every 2 weeks I do a 5g WC on the weekend to clean my substrate with a gravel vac. But I used to just do 5g a week.

[hobogato]

5 gallons twice a week on my 300 gallon total volume system. no skimmer - very large fuge. once a month i do 15 gallons instead of the normal 5 gallons on one particular day to siphon both overflows and detritus out of the parts of the sump where it collects

[wmilas]

1000 gallons, I change 50 gallons every 2 to 3 weeks, depending on what else I have to do on maintenance day

[glparr]

65 gal.: 20 gal. weekly
40br: 10 gal. weekly

[Kent D.]

90 gallon tank - water change of 20 gallons every other week...seems to work pretty good.