martiniduck
Aquarium Advice Activist
I have been doing 50% PWC every week. I have my tank at its capacity for fish, and I think I tend to over feed them. Two tanks both community, one 10G and one 29G. The 29 G has been running for a year and the ten gallon for six months. When doing test on the water, I don't get any Amonia readings, no Nitrate, but my Nitrates are a little on the high side. I have a hard time telling the difference on my test card. They are somewhere between 25-100, the shades of red in the test tube and on the card are hard to see a difference in shade. Back to the issue. I have read in some books that the more changes and the bigger the PWC the better and some books that say that too big of a water change will shock a fish. I have not have any health concerns with my tanks, in fact my mollies, guppies, and platies all have bread monthly. How often is a PWC to be done and how much should be changed?