I just completed a 4gallon water change in my 40gallon tank and i have a few questions:
When is the recommended time for a water change (I had my tank for 3 weeks prior to today's water change. Today was my first ever water change)?
How much water should be replaced (As mentioned above, I did a 4gallon water change)?
Should I test the "new" water to try to match everything as close as possible? Will there be any negative impacts on my livestock? (The water I used was from the LFS
. Their salinity was lower than my tank salinity)
How about the temp? (My tank temp is 80 and their water was at 78 )
Thanks in advance!