How many water changes do you do?

[Dr. Reef]

it all depends on ur filteration and water chemistry. i used to do 30% total, 15% every 2 weeks but now i do 1% daily.

 

[SKurj]

I let mine go 2 months without a water change and my nitrates skyrocketed. I started this week doing a a little more than 10% every couple of days and it is amazing how fast the green algae is starting to subside. I will be sticking to 10%+- from now on.
A 40 long with no sump, and not a light bioload.

 

[ValorG]

25% every 2-3 weeks

 

[Windirmere]

29g biocube with sps mostly and i change 2gallons a week sometimes 2gallons every other week. I have 4 fish and feed every day a small amount, skimmer barely pulls anything and my readings are always very low for Nitates if they even show up. But I change the water out to help keep Calcium and the other minerals levels up

 

[TheKman]

i have a 55g, with a 20g sump, I take a turkey baster to my sand and rocks to blow all the detrious to the filtersock, then i'll stop my return, suck all the crap out of my sump, take a shop vac and suck the rest of the gunk out, fill with fresh salt water and pump it back in. i do this about 1 time a week, with a less extensive water change during the week of about 10 gallons.. My nitrates are still high - so should I do more water changes?

 

[Bpb]

55 gallon, 20 gallon sump. Rock and sand displacement gives me oh about 60-65 total water volume. Was doing 5 gallons a week for a while until I got a bad dinoflagellates outbreak. I have been advised to stop water changes until they're gone, but remove them mechanically several times a day. So...for the foreseeable future. Zero water change. But I skim heavily, have a refugium, and gfo and carbon reactors going with a small bio load and light feeding.

 

[Jon B]

I have two nano tanks running: 13.3 gallon containing an actual 9 gallons of water; 10 gallon tank with an actual 6.5 gallons of water. I run HOB filters containing Purigen and GFO in bags. I am not running skimmers. I do 10% water changes every other week. So far, so good.

 

[csauer52]

I do 15% once per month in my 150 SPS tank. I run GFO/GAC 24X7 (at reduced rates from manufacturer recommendations) and skim heavily. I prefer a minimalist approach to reef keeping once the system is stable.

 

[keithhays]

It all depends on what you are trying to do with the WC's. There are tanks with 2500 lbs. of fish in 5000 gallons of water. They would do a 10% change per day or more. There are 10 gallon sps only tanks that maybe do 10% a month. Personally, I have 300 gallons and am really changing the water to keep everything as close to the original balance as possible and to maybe help get rid of things I can't test for. I change 750ml 24 times a day or about 5 gallons per day which is about a 50% water change per month. TIP: always buy the largest salt quantity you can afford and avoid dosing anything other than maybe calcium & ALK which are next to free.

 

[indyjaco]

I change about 5 gallons a week on my 90 gallon system.

 

[megadeth72]

I do zero unless there is a problem with ca/alk imbalance