water changes
 

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

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

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

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

+1 brad

I do 10g a week on a 42g tank

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.

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.

awesome thank you for the quick response!!

Every 10 days I do 50g or so.