water changes

[Amadod2]

How often do you guys do water changes? i have a 75g and was thinking of doing 5g once a week, any thoughts?

[Dearth]

Most people do a weekly or biweekly water change of 15-20% that way you replenish lost trace elements in your water and help keep your tank in good condition water wise

[Aquattro]

5g in 75 is pretty much pointless, IMO. I'd do minimum 25 biweekly.

[Amadod2]

every week i do add trace elements, i guess thats why my tanks have always done ok, but im wanted to start the water changes more frequently

[Proteus]

+1 brad

I do 10g a week on a 42g tank

[Aquattro]

every week i do add trace elements

Unless you're testing for them and know they're lacking, I wouldn't bother. A good biweekly water change will take care of that for you.

[wreck]

Quick question, when u guys say 15-20% wc. Is that display volume or total volume of system? I have a 65 with a 40 b sump , how much would u change?

[Aquattro]

Quick question, when u guys say 15-20% wc. Is that display volume or total volume of system? I have a 65 with a 40 b sump , how much would u change?

Total volume. Figure in rock displacement, sump isn't full, etc. For you, I'd say 20-25g biweekly.

[wreck]

awesome thank you for the quick response!!

[mseepman]

Every 10 days I do 50g or so.

[AdamsB]

I try to do 20g every 2-3 weeks. I find my lps react better with more frequent changes. I have a 90 gallon with a 30 gallon sump so I round it off to 100 gallon total to account for rock and sand displacement.

[mike31154]

23g every 21 or so days on my sumpless 77.