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Discussion Starter · #3 ·
Nitrates are a lot less, but i've never went over a 30% water change lol, doing a 50% i start to panic ...

Especially my 92 gallon tank in the livingroom (My Oscar Tank) i had my missus out measuring half the tank so i wouldnt go over ....

Even then it seems to much, altho my fish dont seem to mind tbh, and i hear folk do 75% changes :-?

Brucey
 

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Well if you do a 50% change then the nitrates would always be half what they were. The question is, can you keep the nitrates below 20ppm with a weekly 50% water change?
 

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It also depends on what your incoming water is like. For locations with water that has saturated CO2 or little buffering capacity, you'll get quite a bit of fluctuation in the tank when you do larger volume water changes. Here, I regularly do 80% changes on bristlenose growout tanks with no problem. I've lived places where 40% changes stressed the fish though. It really just depends on your individual conditions and parameters. Watch the fish. They'll tell you if you're doing too much.

Barbie
 
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