Water change %'s

So I have a 55g Fowler and I'm changeing 20% of my water anyone have thoughts or opinions on this amount

 

How often are you doing the WC.

 

Dry forgot to mention that. Im changeing it every 2 weeks

 

I do 20% monthly.

 

That should be plenty. I do 5% weekly.

 

Honestly I would say percentage is probably a little higher since a 55 doesn't hold 55g and that's what I based my calculation on I forget what a 55 holds?

 

How many gallons does a 55 hold

 

Take into consideration the thickness of your glass, sump volume and water displacement due to rocks, sand and equipment. I don't know how much LR etc you have but a rough estimate, I would think about 50 gallons total.


---
I am here: http://maps.google.com/maps?ll=10.507715,-61.390567

 

With a FOWLR, you only need to change water to remove nutrients, otherwise you're just wasting time and salt. What are your Nitrate and Phosphate levels before a water change?

 

how often do you do changes?