After reading all the posts I wish I had a nano tank. I do 55 gal water change weekly on a 300 gal tank. Is it a bad thing my kids college fund went into salt mix?

DUDE! That's a little nuts...well, for me, considering my aquarium IS 55 gallons, lol.

My parents spent my college fund on a time share. :mrgreen:

I do a 40 gallon change once a month on 200 gallon system.

I'm about the same as Joe, 50g change once a month on my 220.

I do a 25 gallon water change every-other week on a 125 gallon system. I used to do weekly 3 gallon water changes on my 33 gallon. I miss those days. :sad: But the bigger tank is way better!:biggrin:

I do 20 gal biweekly which is about 10% of my total water capicity, (more like 15 - 20% if all the rock is put in the equation). I used to do 20 gal weekly on 160 gal but I started to think that was a waste of my time and switched to biweekly after I plumbed in my refugium. The system certainly hasn't suffered from it.

Hey!
where's the not as often as i should option! ;)

10gal every 2 to 4 wks on a 77 with a 30 gal sump/fuge

10gal every 2 to 4 wks on a 77 with a 30 gal sump/fuge. A good sized fuge with lots of macro algae has taken me from having to do weekly water changes to not even 'having' to do them when I do. Couldn't imagine ever having a tank without a fuge now that I have one.

Water changes help replenish trace elements so even if the water seems to be ok it's still a good idea to do them on occasion:smile: